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1

Noyes, MN Natural Gas Pipeline Imports From Canada (Million Cubic...  

Annual Energy Outlook 2012 (EIA)

data. Release Date: 1302015 Next Release Date: 2272015 Referring Pages: U.S. Natural Gas Pipeline Imports by Point of Entry Noyes, MN Natural Gas Imports by Pipeline from...

2

8, 58475899, 2008 Odin NOy climatology  

E-Print Network (OSTI)

ACPD 8, 5847­5899, 2008 Odin NOy climatology S. Brohede et al. Title Page Abstract Introduction Chemistry and Physics Discussions Odin stratospheric proxy NOy measurements and climatology S. Brohede1 , C Publications on behalf of the European Geosciences Union. 5847 #12;ACPD 8, 5847­5899, 2008 Odin NOy climatology

Paris-Sud XI, Université de

3

2, 22592296, 2002 Partitioning of NOy  

E-Print Network (OSTI)

oxide (NO), nitrogen dioxide (NO2), peroxyacetyl nitrate (PAN) and total reactive nitrogen (NOy and Physics Discussions Partitioning of reactive nitrogen (NOy) and dependence on meteorological conditions Screen / Esc Print Version Interactive Discussion c EGU 2002 Abstract Results of continuous nitrogen

Boyer, Edmond

4

U.S. Natural Gas Pipeline Imports by Point of Entry  

U.S. Energy Information Administration (EIA) Indexed Site

2007 2008 2009 2010 2011 2012 View 2007 2008 2009 2010 2011 2012 View History U.S. Total 3,836,770 3,632,403 3,299,402 3,309,747 3,119,753 2,963,140 1985-2012 From Canada 3,782,708 3,589,089 3,271,107 3,279,752 3,117,081 2,962,827 1973-2012 Eastport, ID 704,429 688,782 693,892 708,806 606,099 634,194 1996-2012 Calais, ME 106,643 121,295 114,081 131,035 149,736 76,540 1998-2012 Detroit, MI 81 753 21 79 19 0 1996-2012 Marysville, MI 876 2,252 5,651 5,694 9,946 8,099 1996-2012 St. Clair, MI 9,633 9,104 6,544 5,591 5,228 3,531 1996-2012 International Falls, MN 1996-2006 Noyes, MN 499,863 476,948 478,368 447,079 544,135 401,717 1996-2012 Warroad, MN 4,813 4,800 4,380 4,325 4,551 4,610 1996-2012 Babb, MT 4,580 4,057 6,702 6,671 12,807 15,525 1996-2012

5

Low Dose Radiation Research Program: Kanokporn Noy Rithidech, Ph.D.  

NLE Websites -- All DOE Office Websites (Extended Search)

Kanokporn Noy Rithidech, Ph.D. Kanokporn Noy Rithidech, Ph.D. University of New York at Stony Brook Currently Funded Projects Induction of Genomic Instability In vivo by Low Doses of 137Cs Gamma Rays Technical Abstracts 2006 Workshop: No Evidence for In Vivo Induction of Genomic Instability in Bone Marrow Cells Collected from Mice Exposed to Low-Dose 137CS γ Rays Rithidech, K.N., Loetchutinat, C., Honikel, L., and Whorton, E.B. 2005 Workshop: Induction of Genomic Instability in Vivo by Low Doses of 137Cs γ rays. Rithidech, K.N., Leotchutinat, C., Honikel, L., Simon, S.R. and Whorton, E.B. 2003 Workshop: Induction of Genomic Instability in vivo by Low Doses of 137Cs y rays Rithidech. K., Whorton, E.B., Tungjai, M., Ar-Bab, E., Simon, S.R. Tawde, M. and Anderson, C.W. 2002 Workshop: Induction of Genomic Instability In vivo by Low Doses of 137Cs gamma rays.

6

A three-dimensional total odd nitrogen (NOy) simulation during SONEX using a stretched-grid chemical transport model  

E-Print Network (OSTI)

Assimilation System (GEOS-STRAT DAS). A new algorithm is used to estimate the lightning flash rates needed to calculate NOy emission by lightning. This algorithm parameterizes the flash rate in terms of upper. The lightning algorithm reproduces the temporally and spatially averaged total flash rate accurately; however

Stenchikov, Georgiy L.

7

U.S. Price of Natural Gas Pipeline Exports by Point of Exit  

U.S. Energy Information Administration (EIA) Indexed Site

2007 2008 2009 2010 2011 2012 View 2007 2008 2009 2010 2011 2012 View History U.S. Total 6.96 8.62 4.34 4.75 4.35 3.08 1985-2012 To Canada 7.17 8.86 4.59 4.84 4.45 3.17 1985-2012 Eastport, ID -- 7.43 4.49 5.85 4.74 -- 1998-2012 Calais, ME -- -- 5.62 4.53 4.46 4.30 2007-2012 Detroit, MI 6.88 8.37 4.01 4.69 4.26 3.10 1996-2012 Marysville, MI 7.77 7.48 4.85 4.87 4.48 3.18 1996-2012 Sault Ste. Marie, MI 7.13 8.75 5.04 5.27 4.23 3.20 1999-2012 St. Clair, MI 7.24 8.96 4.62 4.86 4.45 3.11 1996-2012 Noyes, MN -- -- -- -- 3.90 3.46 1998-2012 Warroad, MN 1999-2002 Babb, MT -- -- -- -- 3.39 -- 1996-2012 Havre, MT 6.16 8.14 3.63 4.05 3.82 2.40 1998-2012 Port of Morgan, MT 1998-2006 Sherwood, ND 1999-2006 Pittsburg, NH -- 7.61 -- -- 7.54 2.62 2007-2012

8

Advance View Proofs Thermodynamic Description of the Mg-Mn, Al-Mn and Mg-Al-Mn Systems  

E-Print Network (OSTI)

Advance View Proofs Thermodynamic Description of the Mg-Mn, Al-Mn and Mg-Al-Mn Systems Using-consistent thermodynamic model of the Mg-Mn, Al-Mn and Mg-Al-Mn systems has been developed. The major difference between work on the Al-Mn system that uses the same model for the liquid phase reveals that better agreement

Medraj, Mamoun

9

Magnetism of Al-Mn quasicrystals  

Science Journals Connector (OSTI)

The effect of symmetry and concentration of Mn on the magnetism of Al-Mn quasicrystals has been investigated through self-consistent density-functional calculations using molecular clusters and supercell band-structure schemes. A single Mn atom surrounded by 54 Al atoms in an icosahedral or a cuboctahedral structure is found to be nonmagnetic. However, as the Mn concentration is increased, moments develop on Mn sites whose magnitude and coupling depend on their location.

Feng Liu; S. N. Khanna; L. Magaud; P. Jena; V. de Coulon; F. Reuse; S. S. Jaswal; X.-G. He; F. Cyrot-Lackman

1993-07-01T23:59:59.000Z

10

Category:Minneapolis, MN | Open Energy Information  

Open Energy Info (EERE)

MN MN Jump to: navigation, search Go Back to PV Economics By Location Media in category "Minneapolis, MN" The following 16 files are in this category, out of 16 total. SVFullServiceRestaurant Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png SVFullServiceRestauran... 89 KB SVHospital Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png SVHospital Minneapolis... 85 KB SVLargeHotel Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeHotel Minneapol... 85 KB SVLargeOffice Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeOffice Minneapo... 82 KB SVMediumOffice Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png SVMediumOffice Minneap... 83 KB SVMidriseApartment Minneapolis MN Northern States Power Co (Minnesota) Excel Energy.png

11

Magnetism of Mn layers on Fe(100)  

Science Journals Connector (OSTI)

The magnetic state of epitaxial overlayers of Mn grown on Fe(100) is studied using spin-polarized electron energy loss spectroscopy. Nonzero exchange asymmetries are found, demonstrating that the surface layer of the Mn overlayers has a net magnetic moment. The exchange asymmetry oscillates with a period of about two atomic layers as the Mn overlayer thickness is varied, proving that the Mn forms ferromagnetic (100) sheets and that the sheets align antiferromagnetically. The average Mn exchange splitting is found to be 2.9 eV, indicating a magnetic moment of the order 3?B.

T. G. Walker and H. Hopster

1993-08-01T23:59:59.000Z

12

Structural And Physical Characterization of Tetranuclear [Mn**II(3)Mn**IV] And [Mn**II(2)Mn**III(2)] Valence-Isomer Manganese Complexes  

SciTech Connect

Two tetranuclear Mn complexes with an average Mn oxidation state of +2.5 have been prepared. These valence isomers have been characterized by a combination of X-ray crystallography, X-ray absorption spectroscopy, and magnetic susceptibility. The Mn{sup II}{sub 3}Mn{sup IV} tetramer has the Mn ions arranged in a distorted tetrahedron, with an S = 6 ground spin state, dominated by ferromagnetic exchange among the manganese ions. The Mn{sup II}{sub 2}Mn{sup III}{sub 2} tetramer also has a distorted tetrahedral arrangement of Mn ions but shows magnetic behavior, suggesting that it is a single-molecule magnet. The X-ray absorption near-edge structure (XANES) spectra for the two complexes are similar, suggesting that, while Mn XANES has sufficient sensitivity to distinguish between trinuclear valence isomers (Alexiou et al. Inorg. Chem. 2003, 42, 2185), similar distinctions are difficult for tetranuclear complexes such as that found in the photosynthetic oxygen-evolving complex.

Zaleski, C.M.; Weng, T.-C.; Dendrinou-Samara, C.; Alexiou, M.; Kanakaraki, P.; Hsieh, W.-Y.; Kampf, J.; Penner-Hahn, J.E.; Pecoraro, V.L.; Kessissoglou, D.P.

2009-05-28T23:59:59.000Z

13

4, 81718199, 2004 Modelling of NOy  

E-Print Network (OSTI)

Profile Monitor of the At- mosphere (LPMA) and the DOAS experiments under stratospheric balloon. Photo

Paris-Sud XI, Université de

14

Microsoft Word - Mn.doc  

NLE Websites -- All DOE Office Websites (Extended Search)

5 5 Structural Determination of Marine Bacteriogenic Manganese Oxides John R. Bargar, Samuel M. Webb (Stanford Synchrotron Radiation Laboratory), and Bradley M. Tebo (Oregon Health and Science University) Bacterial oxidation of Mn(II) impacts the global geochemical cycling of carbon, nitrogen, sulfur, nutrients, and contaminants in the environment. Manganese is abundant in the biosphere (~10 14 Kg of suspended and dissolved manganese in the oceans) and is second only to iron in relative terrestrial abun- dance of transition metals. Manganese is an important nutrient in the marine water column and is fundamentally required for photosynthesis. The acquisition of manganese by organisms and the biogeochemistry of manganese in the oceans is therefore an

15

Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn  

E-Print Network (OSTI)

Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn Octahedral Layer Structure M E N G Q I A N G(II) sorption mechanisms were determined at pH 7 and at different Ni(II) loadings, using isotherm and extended X in the interlayer of the BioMnOx and the maximum Ni(II) sorption capacity increases as the formation pH of Bio

Sparks, Donald L.

16

Mn/DOT County Road Safety Plans  

E-Print Network (OSTI)

Roads Program !! Minnesota Central Safety Funds !! Foster safety culture among county stakeholders 41 Mn/DOT County Road Safety Plans CTS Annual Research Conference April 27 & 28, 2010 Howard Preston & Objectives !! Project Overview !! Schedule, Participating Counties, Approach !! Safety Emphasis Areas

Minnesota, University of

17

MN Office of Energy Security | Open Energy Information  

Open Energy Info (EERE)

MN Office of Energy Security MN Office of Energy Security Jump to: navigation, search Name MN Office of Energy Security Place St. Paul, MN Website http://www.mnofficeofenergysec References MN Office of Energy Security[1] Information About Partnership with NREL Partnership with NREL Yes Partnership Type Test & Evaluation Partner Partnering Center within NREL Electricity Resources & Building Systems Integration LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! MN Office of Energy Security is a company located in St. Paul, MN. References ↑ "MN Office of Energy Security" Retrieved from "http://en.openei.org/w/index.php?title=MN_Office_of_Energy_Security&oldid=379158" Categories: Clean Energy Organizations Companies Organizations

18

Category:International Falls, MN | Open Energy Information  

Open Energy Info (EERE)

MN MN Jump to: navigation, search Go Back to PV Economics By Location Media in category "International Falls, MN" The following 16 files are in this category, out of 16 total. SVFullServiceRestaurant International Falls MN Northern States Power Co (Minnesota) Excel Energy.png SVFullServiceRestauran... 88 KB SVHospital International Falls MN Northern States Power Co (Minnesota) Excel Energy.png SVHospital Internation... 84 KB SVLargeHotel International Falls MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeHotel Internati... 85 KB SVLargeOffice International Falls MN Northern States Power Co (Minnesota) Excel Energy.png SVLargeOffice Internat... 83 KB SVMediumOffice International Falls MN Northern States Power Co (Minnesota) Excel Energy.png

19

Energy absorption in Ni-Mn-Ga/ polymer composites  

E-Print Network (OSTI)

In recent years Ni-Mn-Ga has attracted considerable attention as a new kind of actuator material. Off-stoichiometric single crystals of Ni2MnGa can regularly exhibit 6% strain in tetragonal martensites and orthorhombic ...

Feuchtwanger, Jorge

2006-01-01T23:59:59.000Z

20

Modelling Al and Mn in the open ocean  

E-Print Network (OSTI)

Modelling Al and Mn in the open ocean Marco van Hulten*, Alessandro Tagliabue, Jean-Claude Dutay van Hulten: Modelling Al and Mn in the open ocean 1 #12;Outline Introduction Model of aluminium Constraining dust flux Model of manganese Conclusions Marco van Hulten: Modelling Al and Mn in the open ocean 2

Haak, Hein

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

MN4602 Crouch 2004 REASSESSING WEAPON SYSTEM  

E-Print Network (OSTI)

MN4602 Crouch 2004 REASSESSING WEAPON SYSTEM OPERATIONAL TEST & EVALUATION METHODOLOGIES LTC Thom support assessing a weapon systems true cost and performance characteristics? S1: Can/should cost methodologies adequately address weapon systems total ownership cost (TOC)? S3: Are there critical cost

22

"MBUF Demo" "Mn Road Fee Test"  

E-Print Network (OSTI)

(40 mpg) Electric Vehicle (non-gas powered) State Tax * Federal Tax ** State Tax * Federal Tax"MBUF Demo" "Mn Road Fee Test" "IntelliDrive Connected Vehicles for Safety, Mobility and User Fee Overview Six Months In-Vehicle Data Collection Participant Recruited Equipment Deployed First Odometer

Minnesota, University of

23

Mn/DOT's Project Peer Review  

E-Print Network (OSTI)

Mn/DOT's Project Management Peer Review Creating a Project Management Culture 2010 CTS Research and perspectives ·Peer Review Process and Results ·Construction Industry Perspective ·Next Steps ·Q & A #12;Why a Peer Review? Why Project Management? ·Improve project delivery performance ­ on time, on budget (an

Minnesota, University of

24

Thermal Stability of MnBi Magnetic Materials. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

MnBi attracts great attention in recent years for its great potential as permanent magnet materials. It is unique because its coercivity increases with increasing temperature,...

25

Perpendicular ferrimagnetism in strained Mn{sub 2}As film  

SciTech Connect

Ferrimagnetic Mn{sub 2}As thin films with perpendicular magnetic anisotropy were successfully grown on Si(100) by molecular-beam epitaxy. From the reflection high-energy electron diffraction and X-ray diffraction patterns, the orientation of the Mn{sub 2}As film on Si was along the c-axis in the tetragonal crystal structure. Mn{sub 2}As film exhibited ferrimagnetic ordering at temperatures greater than 300 K, which differs from antiferromagnetic or paramagnetic behaviors in the bulk form. The magnetic moment of Mn{sub 2}As determined by saturated magnetization was 0.51 {mu}{sub B} per unit cell.

Hwang, Younghun; Choi, Jeongyong; Duc Dung, Dang; Shin, Yooleemi; Cho, Sunglae [Department of Physics, University of Ulsan, Ulsan 680-749 (Korea, Republic of)

2011-03-15T23:59:59.000Z

26

Magneto-optical studies of ensembles of semimagnetic self-organized Cd(Mn)Se/Zn(Mn)Se Quantum Dots  

SciTech Connect

Ensembles of Cd(Mn)Se/ZnSe and CdSe/Zn(Mn)Se semimagnetic self-organized quantum dots with different Mn content have been studied by photoluminescence and resonant Raman scattering under strong magnetic fields in Faraday and Voigt geometries and with spectral and polarization selective excitation. Electron spin-flip Raman scattering has been observed in Voigt geometry in the structures with large Mn content. Narrow exciton peaks completely ?{sup ?}?{sup +} polarized have been observed under selective excitation in Faraday geometry in the structures with medium and small Mn content. A number of specific effects manifested themselves in the structures with a smallest Mn content where no Zeeman shift of the photoluminescence bands was observed.

Reshina, I. I.; Ivanov, S. V.; Toropov, A. A. [Ioffe Physical Technical Institute of RAS, Polytechnicheskaya 26, 194021 St. Petersburg (Russian Federation)

2013-12-04T23:59:59.000Z

27

High-Resolution Structure of the Photosynthetic Mn4Ca Catalyst from X-ray Spectroscopy  

E-Print Network (OSTI)

the Photosynthetic Mn 4 Ca Catalyst from X-ray Spectroscopystructure of the Mn 4 Ca catalyst at high-resolution whichthe structure of Mn 4 Ca catalyst as it cycles through the

Yano, Junko

2008-01-01T23:59:59.000Z

28

Thermal stability of MnBi magnetic materials  

SciTech Connect

MnBi has attracted much attention in recent years due to its potential as a rare-earth-free permanent magnet material. It is unique because its coercivity increases with increasing temperature, which makes it a good hard phase material for exchange coupling nanocomposite magnets. MnBi phase is difficult to obtain, partly because the reaction between Mn and Bi is peritectic, and partly because Mn reacts readily with oxygen. MnO formation is irreversible and harmful to magnet performance. In this paper, we report our efforts toward developing MnBi permanent magnets. To date, high purity MnBi (>90%) can be routinely produced in large quantities. The produced powder exhibits 74:6 emu g1 saturation magnetization at room temperature with 9 T applied field. After proper alignment, the maximum energy product (BH) max of the powder reached 11.9 MGOe, and that of the sintered bulk magnet reached 7.8 MGOe at room temperature. A comprehensive study of thermal stability shows that MnBi powder is stable up to 473 K in air.

Cui, Jinfang [Pacific Northwest National Laboratory; Choi, J. P. [Pacific Northwest National Laboratory; Li, G. [Pacific Northwest National Laboratory; Polikarpov, E. [Pacific Northwest National Laboratory; Darsell, J. [Pacific Northwest National Laboratory; Overman, N. [Pacific Northwest National Laboratory; Olszta, M. [Pacific Northwest National Laboratory; Schreiber, D. [Pacific Northwest National Laboratory; Bowden, M. [Environmental Molecular Sciences Laboratory; Droubay, T. [Pacific Northwest National Laboratory; Kramer, Matthew J. [Ames Laboratory; Zarkevich, Nikolay A. [Ames Laboratory; Wang, L L. [Ames Laboratory; Johnson, Duane D. [Ames Laboratory; Marinescu, M. [Electron Energy Corporation; Takeuchi, I. [University of Maryland; Huang, Q. Z. [National Institute of Standards and Technology; Wu, H. [University of Maryland; Reeve, H. [United Technologies Research Center; Vuong, N. V. [University of Texas; Liu, J P. [University of Texas

2014-01-27T23:59:59.000Z

29

Chemiluminescence in the Reaction of Mn Atoms with CF4  

Science Journals Connector (OSTI)

Translational excitation functions have been determined for production of several MnF* statesb5?, c5?+, d5?, and (most probably) e5?+in the reaction of a laser-ablated beam of Mn atoms with gaseous CF4. Although all observed channels show high initial ...

Dale L. Herbertson; Martin R. Levy

1996-08-29T23:59:59.000Z

30

MN471018, Work Planning and Control Manual  

NLE Websites -- All DOE Office Websites (Extended Search)

18, Work Planning and Control Manual 18, Work Planning and Control Manual Sponsor: Michael W. Hazen, 4000 Issue Date: January 3, 2007 Revision Date: June 1, 2009 This document is no longer a CPR. This document implements the requirements of Corporate procedure ESH100.1.WPC.1, Plan and Control Work. IMPORTANT NOTICE: A printed copy of this document may not be the document currently in effect. The official version is the online version located on the Sandia Restricted Network (SRN) MN471018 - WORK PLANNING AND CONTROL MANUAL Subject Matter Expert: Brad Elkin; CA Counterpart: Aden Jackson MN471018 Revision Date: June 1, 2009; Replaces Document: October 28, 2008 Implementation Notice: The requirements outlined in this document must be incorporated into approved comprehensive organizational procedures on or before June 30, 2009. New work planned and conducted after June 30, 2009 shall be performed in accordance with this document. Ongoing work, conducted under an existing, current, and approved PHS and TWD (if required), is authorized until the expiration of the applicable PHS, TWD, or June 30, 2010.

31

Magnetic Moment Enhancement for Mn7 Cluster on Graphene  

SciTech Connect

Mn7 cluster on graphene with different structural motifs and magnetic orders are investigated systematically by first-principles calculations. The calculations show that Mn7 on graphene prefers a two-layer motif and exhibits a ferrimagnetic coupling. The magnetic moment of the Mn7 cluster increases from 5.0 ?B at its free-standing state to about 6.0 ?B upon adsorption on graphene. Mn7 cluster also induces about 0.3 ?B of magnetic moment in the graphene layer, leading to an overall enhancement of 1.3 ?B magnetic moment for Mn7 on graphene. Detail electron transfer and bonding analysis have been carried out to investigate the origin of the magnetic enhancement.

Liu, Xiaojie [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Lin, Hai-Qing [Beijing Computational Science Research Center; Ho, Kai-Ming [Ames Laboratory

2014-08-21T23:59:59.000Z

32

Unusual Structure and Magnetism in MnO Nanoclusters  

E-Print Network (OSTI)

We report an unusual evolution of structure and magnetism in stoichiometric MnO clusters based on an extensive and unbiased search through the potential energy surface within density functional theory. The smaller clusters, containing up to five MnO units, adopt two-dimensional structures; and regardless of the size of the cluster, magnetic coupling is found to be antiferromagnetic in contrast to previous theoretical findings. Predicted structure and magnetism are strikingly different from the magnetic core of Mn-based molecular magnets, whereas they were previously argued to be similar. Both of these features are explained through the inherent electronic structures of the clusters.

Ganguly, Shreemoyee; Sanyal, Biplab; Mookerjee, Abhijit; 10.1103/PhysRevB.83.020411

2011-01-01T23:59:59.000Z

33

Parallel Polarization EPR Characterization of the Mn(III) Center of Oxidized Manganese Superoxide  

E-Print Network (OSTI)

Parallel Polarization EPR Characterization of the Mn(III) Center of Oxidized Manganese Superoxide polarization CW-EPR to investigate the paramagnetic Mn3+ ion of the MnSOD enzyme from Escherichia coli with a positive axial zero-field splitting value, D, are arranged as shown in Figure 1. An EPR signal from the Mn

Miller, Anne-Frances

34

Band-structure analysis from photoreflectance spectroscopy in (Ga,Mn)As  

SciTech Connect

Modulation photoreflectance spectroscopy has been applied to study the band-structure evolution in (Ga,Mn)As epitaxial layers with increasing Mn content. Structural and magnetic properties of the layers were characterized with high-resolution X-ray diffractometry and SQUID magnetometery, respectively. The revealed results of decrease in the band-gap-transition energy in the (Ga,Mn)As layers with increasing Mn content are interpreted in terms of a disordered valence band, extended within the band gap, formed, in highly Mn-doped (Ga,Mn)As, as a result of merging the Mn-related impurity band with the host GaAs valence band.

Yastrubchak, Oksana; Gluba, Lukasz; Zuk, Jerzy [Institute of Physics, Maria Curie-Sklodowska University, 20-031 Lublin (Poland); Wosinski, Tadeusz; Andrearczyk, Tomasz; Domagala, Jaroslaw Z. [Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw (Poland); Sadowski, Janusz [Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland and MAX-Lab, Lund University, 22100 Lund (Sweden)

2013-12-04T23:59:59.000Z

35

DOE - Office of Legacy Management -- Twin Cities Ammunition - MN 0-01  

NLE Websites -- All DOE Office Websites (Extended Search)

Twin Cities Ammunition - MN 0-01 Twin Cities Ammunition - MN 0-01 FUSRAP Considered Sites Site: TWIN CITIES AMMUNITION (MN.0-01) Eliminated from further consideration under FUSRAP - Referred to DOD Designated Name: Not Designated Alternate Name: None Location: New Brighton , Minnesota MN.0-01-1 Evaluation Year: 1987 MN.0-01-2 Site Operations: Site was formerly licensed under 10CFR 70 by the NRC. MN.0-01-1 MN.0-01-2 Site Disposition: Eliminated - No Authority - Referred to DOD MN.0-01-1 Radioactive Materials Handled: None Indicated Primary Radioactive Materials Handled: None Radiological Survey(s): None Indicated Site Status: Eliminated from further consideration under FUSRAP - Referred to DOD MN.0-01-2 Also see Documents Related to TWIN CITIES AMMUNITION MN.0-01-1 - DOE Letter; Mott to Spence; Listings of Military

36

Luminescence in Mn-doped CdS nanocrystals  

Science Journals Connector (OSTI)

We have synthesized Mn-doped CdS nanocrystals (NCs) with size ranging from ... nm. Photoluminescence (PL) spectra of the doped NCs differ from that of the undoped...d-d...transitions. Electron paramagnetic resona...

Angshuman Nag; Sameer Sapra; Subhra Sen Gupta

2008-06-01T23:59:59.000Z

37

Transverse acoustic actuation of Ni-Mn-Ga single crystals  

E-Print Network (OSTI)

Two methods for the transverse acoustic actuation of {110}-cut Ni-Mn-Ga single crystals are discussed. In this actuation mode, crystals are used that have the {110}- type twinning planes parallel to the base of the crystal. ...

Simon, Jesse Matthew

2007-01-01T23:59:59.000Z

38

Magnetic Skyrmion Phase in MnSi Thin Films.  

E-Print Network (OSTI)

??Detailed magnetometry and polarized neutron reflectometry studies were conducted on MnSi thin films grown epitaxially on Si(111) substrates. It is demonstrated that with an in-plane (more)

Wilson, Murray

2013-01-01T23:59:59.000Z

39

Introduction In 1975, Noy-Meir presented a comprehensive, graph-  

E-Print Network (OSTI)

equilibria (i.e. states of zero net cha; Parsons & Chapman 1998). This simple calculation illustrates that grazed grassland is necessarily

Schwinning, Susan - Department of Biology, Texas State University

40

Change in stacking-fault energy with Mn content and its influence on the damping capacity of the austenitic phase in Fe-high Mn alloys  

Science Journals Connector (OSTI)

The effect of Mn content on the damping capacity of ? austenitic ... been studied in relation to the stacking-fault energy ( SFE), on the basis of ... austenite decreases with the increase in the Mn content. The ...

Joong-Hwan Jun; Chong-Sool Choi

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Magnetoluminescence of CdTe/MnTe/CdMgTe heterostructures with ultrathin MnTe layers  

SciTech Connect

CdTe/MnTe/CdMgTe quantum-well structures with one or two monolayers of MnTe inserted at CdTe/CdMgTe interfaces were fabricated. The spectra of the excitonic luminescence from CdTe quantum wells and their variation with temperature indicate that introduction of ultrathin MnTe layers improves the interface quality. The effect of a magnetic field in the Faraday configuration on the spectral position of the exciton-emission peaks indicates that frustration of magnetic moments in one-monolayer MnTe insertions is weaker than in two-monolayer insertions. The effect of a magnetic field on the exciton localization can be explained in terms of the exciton wave-function shrinkage and obstruction of the photoexcited charge-carrier motion in the quantum well.

Agekyan, V. F., E-mail: vfag@rambler.ru [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Holz, P. O. [Polish Academy of Sciences, Institute of Physics (Poland); Karczewski, G. [Linkoeping University (Sweden); Katz, V. N. [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Moskalenko, E. S. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation); Serov, A. Yu.; Filosofov, N. G. [St. Petersburg State University, Fock Institute of Physics (Russian Federation)

2011-10-15T23:59:59.000Z

42

Comparison of the EXAFS Spectra of Heteronuclear MnCa/Sr Model Complexes to the Oxygen-Evolving Mn(4)Ca Complex of Photosystem II  

SciTech Connect

Heterometallic Mn-Ca and Mn-Sr complexes have been prepared and employed as model complexes for Ca and Sr EXAFS spectral comparisons with the Oxygen-Evolving Complex (OEC) of Photosystem II (PS II); these have revealed similarities that support the presence of at least one O atom bridge between the Mn and Ca/Sr in the OEC.

Mishra, A.; Yano, J.; Pushkar, Y.; Abboud, K.A.; Yachandra, V.K.; Christou, G.

2009-06-03T23:59:59.000Z

43

PVP-Assisted ZrO2 coating on LiMn2O4 spinel cathode nanoparticles prepared by MnO2 nanowire templates  

E-Print Network (OSTI)

issues regarding the use of LiMn2O4 spi- nels as cathode materials is their large capacity loss observed active material. However, enhanced rate capabilities can be achieved in nanostructured materials becausePVP-Assisted ZrO2 coating on LiMn2O4 spinel cathode nanoparticles prepared by MnO2 nanowire

Cho, Jaephil

44

Catalytic Properties of MnO, Fe2O3, and MnFe2O4 in the Steam Reforming of Ethanol  

Science Journals Connector (OSTI)

The catalytic activity of manganese ferrite MnFe2O4 and the oxides MnO and Fe2O3 in the steam reforming of ethanol (SRE) has been studied. The similarity...2O3 and MnFe2O4 has been established which may indicate ...

L. Yu. Dolgykh; I. L. Stolyarchuk; L. A. Staraya

2014-09-01T23:59:59.000Z

45

RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT...  

U.S. Energy Information Administration (EIA) Indexed Site

",3,025,"Crude Oil",3402,"NOYES, MN","MINNESOTA",2,260,"CANADA",62,3.86,21.6,"MERCURIA ENERGY TRADING ",4966,"GREEN PORT","TX","TEXAS",3 "applicationvnd.ms-excel","MERCURIA...

46

Adsorption and Oxidation of Elemental Mercury over Ce-MnOx/Ti-PILCs  

Science Journals Connector (OSTI)

A series of innovative CeMn/Ti-pillared-clay (CeMn/Ti-PILC) catalysts combining the advantages of PILCs and CeMn were investigated for elemental mercury (Hg0) capture at 100350 C in the absence of HCl in the flue gas. ... The catalyst characterization indicated that the 6%Ce-6%MnOx/Ti-PILC catalyst possessed a large specific surface area and high dispersion of Ce and Mn on the surface. ... The experimental results indicated that the 6%Ce-6%MnOx/Ti-PILC catalyst exhibited high Hg0 capture (>90%) at 100350 C. ...

Chuan He; Boxiong Shen; Jianhong Chen; Ji Cai

2014-06-23T23:59:59.000Z

47

Spin dependent transport properties of Mn-Ga/MgO/Mn-Ga magnetic tunnel junctions with metal(Mg, Co, Cr) insertion layer  

SciTech Connect

We report a first principles theoretical investigation of spin polarized quantum transport in Mn{sub 2}Ga/MgO/Mn{sub 2}Ga and Mn{sub 3}Ga/MgO/Mn{sub 3}Ga magnetic tunneling junctions (MTJs) with the consideration of metal(Mg, Co, Cr) insertion layer effect. By changing the concentration of Mn, our calculation shows a considerable disparity in transport properties: A tunneling magnetoresistance (TMR) ratio of 852% was obtained for Mn{sub 2}Ga-based MTJs, however, only a 5% TMR ratio for Mn{sub 3}Ga-based MTJs. In addition, the influence of insertion layer has been considered in our calculation. We found the Co insertion layer can increase the TMR of Mn{sub 2}Ga-based MTJ to 904%; however, the Cr insertion layer can decrease the TMR by 668%; A negative TMR ratio can be obtained with Mg insertion layer. Our work gives a comprehensive understanding of the influence of different insertion layer in Mn-Ga based MTJs. It is proved that, due to the transmission can be modulated by the interfacial electronic structure of insertion, the magnetoresistance ratio of Mn{sub 2}Ga/MgO/Mn{sub 2}Ga MTJ can be improved by inserting Co layer.

Liang, S. H.; Tao, L. L.; Liu, D. P., E-mail: dpliu@iphy.ac.cn; Han, X. F., E-mail: xfhan@iphy.ac.cn [State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Lu, Y. [Institut Jean Lamour, UMR 7198, CNRS-Nancy Universit, BP 239, 54506 Vandoeuvre (France)

2014-04-07T23:59:59.000Z

48

New phases in the system LiMnVO{sub 4}-Mn{sub 3}(VO{sub 4}){sub 2}  

SciTech Connect

The synthesis of orthorhombic Mn{sub 3}(VO{sub 4}){sub 2} via a simple solid state route as well as the description of a new tetragonal high temperature phase are reported in this paper. Additionally, the system LiMnVO{sub 4}-Mn{sub 3}(VO{sub 4}){sub 2} (=Mn{sub 1.5}VO{sub 4}), described by the formula Li{sub x}Mn{sub 1.5-x/2}VO{sub 4}, is investigated in detail, showing that substitution of one Mn{sup 2+} in Mn{sub 1.5}VO{sub 4} by two Li{sup +} ions favors the formation of the tetragonal high temperature phase for x{<=}0.22. This substitution is facilitated by the statistical half occupancy of the 4b site by Mn{sup 2+} in tetragonal Mn{sub 1.5}VO{sub 4}, whereas additional crystallographic sites would have to be occupied in the orthorhombic phase. The inverse substitution of Li by Mn in orthorhombic LiMnVO{sub 4} is also shown to be possible in the range 0.72{<=}x{<=}1. For 0.22{<=}x{<=}0.72, there is a large miscibility gap with a two phase mixture of the tetragonal Mn{sub 1.5}VO{sub 4} type and orthorhombic LiMnVO{sub 4} type phases. - Graphical Abstract: The unusual coordination of Mn in the form of a stella quadrangula with the surrounding vanadate groups. Highlights: > First synthesis of orthorhombic Mn{sub 3}(VO{sub 4}){sub 2} via a simple solid state route. > The crystal chemistry of the phases involved is rather complicated and it depends on the amount of Li that is incorporated. > System LiMnVO{sub 4}-Mn{sub 3}(VO{sub 4}){sub 2} (=Mn{sub 1.5}VO{sub 4}), described by the formula Li{sub x}Mn{sub 1.5-x/2}VO{sub 4}, is investigated in detail.

Clemens, Oliver [Universitaet des Saarlandes, Institut fuer Anorganische und Analytische Chemie und Radiochemie, Am Markt, Zeile 5, 66125 Saarbruecken (Germany); Haberkorn, Robert [Universitaet des Saarlandes, Anorganische Festkoerperchemie, Am Markt, Zeile 3, 66125 Saarbruecken (Germany); Beck, Horst Philipp, E-mail: hp.beck@mx.uni-saarland.de [Universitaet des Saarlandes, Institut fuer Anorganische und Analytische Chemie und Radiochemie, Am Markt, Zeile 5, 66125 Saarbruecken (Germany)

2011-10-15T23:59:59.000Z

49

Mn-Fe base and Mn-Cr-Fe base austenitic alloys  

DOE Patents (OSTI)

Manganese-iron base and manganese-chromium-iron base austenitic alloys designed to have resistance to neutron irradiation induced swelling and low activation have the following compositions (in weight percent): 20 to 40 Mn; up to about 15 Cr; about 0.4 to about 3.0 Si; an austenite stabilizing element selected from C and N, alone or in combination with each other, and in an amount effective to substantially stabilize the austenite phase, but less than about 0.7 C, and less than about 0.3 N; up to about 2.5 V; up to about 0.1 P; up to about 0.01 B; up to about 3.0 Al; up to about 0.5 Ni; up to about 2.0 W; up to about 1.0 Ti; up to about 1.0 Ta; and with the remainder of the alloy being essentially iron.

Brager, Howard R. (Richland, WA); Garner, Francis A. (Richland, WA)

1987-01-01T23:59:59.000Z

50

Origin of the charge gap in LaMnPO  

Science Journals Connector (OSTI)

We present high temperature inelastic neutron scattering and magnetic susceptibility measurements of the antiferromagnetic insulator LaMnPO that are consistent with the presence of two-dimensional magnetic correlations up to a temperature Tmax?700K?TN=375 K, the Nel temperature. Optical transmission measurements show the T=300 K direct charge gap ?=1 eV has decreased only marginally by 500 K and suggest it decreases by only 10% at Tmax. Density functional theory and dynamical mean-field theory calculations reproduce a direct charge gap in paramagnetic LaMnPO only when a strong Hund's coupling JH=0.9 eV is included, as well as on-site Hubbard U=8 eV. Our results show that LaMnPO is a Mott-Hund's insulator, in which the charge gap is rather insensitive to antiferromagnetic exchange coupling.

D. E. McNally; J. W. Simonson; K. W. Post; Z. P. Yin; M. Pezzoli; G. J. Smith; V. Leyva; C. Marques; L. DeBeer-Schmitt; A. I. Kolesnikov; Y. Zhao; J. W. Lynn; D. N. Basov; G. Kotliar; M. C. Aronson

2014-11-18T23:59:59.000Z

51

MN471004, Electrical Safety Manual Sponsor: Michael W. Hazen, 4000  

NLE Websites -- All DOE Office Websites (Extended Search)

MN471004, Electrical Safety Manual MN471004, Electrical Safety Manual Sponsor: Michael W. Hazen, 4000 Revision Date: June 9, 2011 Replaces Document Dated: September 4, 2007 This document is no longer a CPR. This document implements the requirements of Corporate Procedure ESH100.2.ELC.1, Manage Electrical Hazards. IMPORTANT NOTICE: A printed copy of this document may not be the document currently in effect. The official version is the online version located on the Sandia Restricted Network (SRN). Subject Matter Experts: Marc Williams and David Paoletta MN471004, Issue S Revision Date: June 9, 2011; Replaces Document Dated: April 29, 2008 Review Date: August 29, 2007 Administrative Changes: February 5, 2008, June 28, 2010, July 28, 2010, May 26, 2011, June 9, 2011, November 28, 2011, February 1, 2012

52

Effect of Composition and Heat Treatment on MnBi Magnetic Materials...  

NLE Websites -- All DOE Office Websites (Extended Search)

Abstract: The metallic compound MnBi is a promising rare-earth-free permanent magnet material. Compare to other rare-earth-free candidates, MnBi stands out for its high...

53

On deformation twinning in a 17.5%Mn-TWIP steel: A physically...  

NLE Websites -- All DOE Office Websites (Extended Search)

On deformation twinning in a 17.5%Mn-TWIP steel: A physically-based phenomenological model. On deformation twinning in a 17.5%Mn-TWIP steel: A physically-based phenomenological...

54

Pulsed laser deposition of Mn doped CdSe quantum dots for improved solar cell performance  

SciTech Connect

In this work, we demonstrate (1) a facile method to prepare Mn doped CdSe quantum dots (QDs) on Zn{sub 2}SnO{sub 4} photoanodes by pulsed laser deposition and (2) improved device performance of quantum dot sensitized solar cells of the Mn doped QDs (CdSe:Mn) compared to the undoped QDs (CdSe). The band diagram of photoanode Zn{sub 2}SnO{sub 4} and sensitizer CdSe:Mn QD is proposed based on the incident-photon-to-electron conversion efficiency (IPCE) data. Mn-modified band structure leads to absorption at longer wavelengths than the undoped CdSe QDs, which is due to the exchange splitting of the CdSe:Mn conduction band by the Mn dopant. Three-fold increase in the IPCE efficiency has also been observed for the Mn doped samples.

Dai, Qilin; Wang, Wenyong, E-mail: wwang5@uwyo.edu, E-mail: jtang2@uwyo.edu; Tang, Jinke, E-mail: wwang5@uwyo.edu, E-mail: jtang2@uwyo.edu [Department of Physics and Astronomy, University of Wyoming, Laramie, Wyoming 82071 (United States); Sabio, Erwin M. [Department of Chemistry, University of Wyoming, Laramie, Wyoming 82071 (United States)

2014-05-05T23:59:59.000Z

55

Mn12-acetate thin film patterns and their interaction with superconductors  

E-Print Network (OSTI)

Mn12-acetate single-molecule magnets (SMMs) are nano-scale magnets showing a strong magnetic anisotropy, slow relaxation and stepwise magnetic hysteresis curves. Possible applications of Mn12-acetate, e.g. for ultra high density magnetic information...

Kim, Kyongwan

2009-05-15T23:59:59.000Z

56

Synthesis, structural and photocatalytic studies of Mn-doped CdS nanoparticles  

Science Journals Connector (OSTI)

Mn-doped CdS nanoparticles (Cd1?x Mn x S; where x...=0.000.10) were synthesized by a chemical precipitation method. The synthesized products were characterized ...

Ruby Chauhan; Ashavani Kumar; Ram Pal Chaudhary

2013-02-01T23:59:59.000Z

57

LiMnPO4 Nanoplate Grown via Solid-State Reaction in Molten Hydrocarbon...  

NLE Websites -- All DOE Office Websites (Extended Search)

LiMnPO4 Nanoplate Grown via Solid-State Reaction in Molten Hydrocarbon for Li-ion Battery Cathode. LiMnPO4 Nanoplate Grown via Solid-State Reaction in Molten Hydrocarbon for Li-ion...

58

Engineering the magnetic properties of the Mn13 cluster by doping  

E-Print Network (OSTI)

With a goal to produce a giant magnetic moment in a Mn13 cluster that will be useful for practical applications, we have considered the structure and magnetic properties of a pure Mn13 cluster and substitutionally doped ...

Datta, Soumendu

59

Distinct local electronic structure and magnetism for Mn in amorphous Si and Ge  

E-Print Network (OSTI)

Li, A. P. et al. Magnetism in Mn x Ge 1-x semiconductorsElectronic Structure and Magnetism for Mn in Amorphous Sistructure that determines magnetism. Figure 3 shows XAS data

Zeng, Li

2010-01-01T23:59:59.000Z

60

Geometric and Electronic Structures of Tc and Mn Clusters by Density Functional Calculations  

Science Journals Connector (OSTI)

The geometric structures of Tc2-Tc5 and Mn2-Mn8 clusters were optimized by the Amsterdam density functional method. The trimeric, tetrameric, and pentameric Tc clusters exhibit the equilibrium structures of isosc...

R. Sekine; R. Kondo; T. Yamamoto; J. Onoe

2003-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

X-ray absorption study of the electronic structure of Mn-doped amorphous Si  

E-Print Network (OSTI)

X-ray absorption study of the electronic structure of Mn-?x ) is studied by X-ray absorption spectroscopy at the Mn Land featureless L 3,2 absorption peaks, corresponding to an

Zeng, Li

2008-01-01T23:59:59.000Z

62

Building of a Novel Mn12 Single Molecule Magnet by Assembly of...  

NLE Websites -- All DOE Office Websites (Extended Search)

Building of a Novel Mn12 Single Molecule Magnet by Assembly of Anisotropic Triangles Building of a Novel Mn12 Single Molecule Magnet by Assembly of Anisotropic Triangles Print...

63

Low-temperature magnetization of (Ga,Mn) As semiconductors  

E-Print Network (OSTI)

der Laan,8 C. T. Foxon,2 and B. L. Gallagher2 1Institute of Physics ASCR, Cukrovarnick? 10, 162 53 Praha 6, Czech Republic 2School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom 3Institute of Physics ASCR, Na... is organized as follows. In Sec. II we identify the key physical considerations related to ground-state mag- netization of #1;Ga,Mn#2;As ferromagnets by focusing first on a single Mn#1;d5+hole#2; complex and approximating the total magnetization...

Jungwirth, T.; Masek, J.; Wang, KY; Edmonds, KW; Sawicki, M.; Polini, M.; Sinova, Jairo; MacDonald, AH; Campion, RP; Zhao, LX; Farley, NRS; Johal, TK; van der Laan, G.; Foxon, CT; Gallagher, BL.

2006-01-01T23:59:59.000Z

64

Structure and luminescence of annealed nanoparticles of ZnS:Mn A. D. Dinsmore,a)  

E-Print Network (OSTI)

,10 Y2O3:Eu,11­13 LaPO4:Eu, Ce and Tb,14 CdS:Mn,15 CdSe:Mn,16 ZnS:Cu,17 ZnS:Tb,18 and ZnS:Mn,19­32 which temperatures5,6 and pressures.7,8 In addition to their funda- mental interest, doped semiconductor describe experimental studies of the structure and luminescence of nanoparticles of ZnS doped with Mn

Dinsmore, Tony

65

Novel frustrated magnetic lattice based on triangular [Mn3(m3-F)] clusters with tetrazole ligands{  

E-Print Network (OSTI)

Novel frustrated magnetic lattice based on triangular [Mn3(m3-F)] clusters with tetrazole ligands701840a Unprecedented [MnII 3(m3-F)(m-N­N)3] triangular clusters with tetrazole ligands are linked by Mn the tetrazolate ligands, which possess additional N-donor sites for network formation. To our knowledge, [M3(m3-X

Gao, Song

66

MnO nanorods on graphene as an anode material for high capacity lithium ion batteries  

Science Journals Connector (OSTI)

The MnO/graphene hybrid nanocomposites were prepared by an in...2 nanorods were attached on the graphene oxides (GOs) to form the MnO2.../GO nanocomposites, which were reduced to the MnO/graphene hybrid under arg...

Tonghua Wu; Feiyue Tu; Suqin Liu; Shuxin Zhuang

2014-02-01T23:59:59.000Z

67

On the role of Mn(IV) vacancies in the photoreductive dissolution of hexagonal birnessite  

SciTech Connect

Photoreductive dissolution of layer type Mn(IV) oxides (birnessite) under sunlight illumination to form soluble Mn(II) has been observed in both field and laboratory settings, leading to a consensus that this process is a key driver of the biogeochemical cycling of Mn in the euphotic zones of marine and freshwater ecosystems. However, the underlying mechanisms for the process remain unknown, although they have been linked to the semiconducting characteristics of hexagonal birnessite, the ubiquitous Mn(IV) oxide produced mainly by bacterial oxidation of soluble Mn(II). One of the universal properties of this biogenic mineral is the presence of Mn(IV) vacancies, long-identified as strong adsorption sites for metal cations. In this paper, the possible role of Mn vacancies in photoreductive dissolution is investigated theoretically using quantum mechanical calculations based on spin-polarized density functional theory (DFT). Our DFT study demonstrates unequivocally that Mn vacancies significantly reduce the band-gap energy for hexagonal birnessite relative to a hypothetical vacancy-free MnO{sub 2} and thus would increase the concentration of photo-induced electrons available for Mn(IV) reduction upon illumination of the mineral by sunlight. Calculations of the charge distribution in the presence of vacancies, although not fully conclusive, show a clear separation of photo-induced electrons and holes, implying a slow recombination of these charge-carriers that facilitates the two-electron reduction of Mn(IV) to Mn(II).

Kwon, K.D.; Refson, K.; Sposito, G.

2009-06-01T23:59:59.000Z

68

Materials Research for Environment and Energy Hydrogen Embrittlement in Fe-Mn-C  

E-Print Network (OSTI)

Materials Research for Environment and Energy - 1 - Hydrogen Embrittlement in Fe-Mn-C High Strength. Dierk RAABE (MPIE) #12;Materials Research for Environment and Energy - 5 - High Mn austenitic steels twinning. #12;Materials Research for Environment and Energy - 9 - However, high Mn steels undergo premature

Cambridge, University of

69

Cationic disorder and Mn{sup 3+}/Mn{sup 4+} charge ordering in the B? and B? sites of Ca{sub 3}Mn{sub 2}NbO{sub 9} perovskite: a comparison with Ca{sub 3}Mn{sub 2}WO{sub 9}  

SciTech Connect

We describe the preparation, crystal structure determination, magnetic and transport properties of two novel Mn-containing perovskites, with a different electronic configuration for Mn atoms located in B site. Ca{sub 3}Mn{sup 3+}{sub 2}WO{sub 9} and Ca{sub 3}Mn{sup 3+/4+}{sub 2}NbO{sub 9} were synthesized by standard ceramic procedures; the crystallographic structure was studied from X-ray powder diffraction (XRPD) and neutron powder diffraction (NPD). Both phases exhibit a monoclinic symmetry (S.G.: P2{sub 1}/n); Ca{sub 3}Mn{sub 2}WO{sub 9} presents a long-range ordering over the B sites, whereas Ca{sub 3}Mn{sub 2}NbO{sub 9} is strongly disordered. By in-situ NPD, the temperature evolution of the structure study presents an interesting evolution in the octahedral size (?MnO?) for Ca{sub 3}Mn{sub 2}NbO{sub 9}, driven by a charge ordering effect between Mn{sup 3+} and Mn{sup 4+} atoms, related to the anomaly observed in the transport measurements at T?160 K. Both materials present a magnetic order below T{sub C}=30 K and 40 K for W and Nb materials, respectively. The magneto-transport measurements display non-negligible magnetoresistance properties in the paramagnetic regime. - Graphical abstract: Comparison between the octahedron size and the magnetic behaviour for Ca{sub 3}Mn{sub 2}NbO{sub 9} in the temperature region where the charge and magnetic order occur. Display Omitted - Highlights: Two novel Mn-containing double perovskites were obtained by solid-state reactions. Both double perovskites are monoclinic (P2{sub 1}/n) determined by XRPD and NPD. Ca{sub 3}Mn{sub 2}WO{sub 9} contains Mn{sup 3+} while Ca{sub 3}Mn{sub 2}NbO{sub 9} includes mixed-valence cations Mn{sup 3+}/Mn{sup 4+}. Ca{sub 3}Mn{sub 2}NbO{sub 9} presents a charge-ordering effect between Mn{sup 3+} and Mn{sup 4+} evidenced by NPD. The magnetic and transport studies evidenced the charge ordering in Ca{sub 3}Mn{sub 2}NbO{sub 9}.

Lpez, C.A., E-mail: calopez@unsl.edu.ar [INTEQUI-rea de Qumica General e Inorgnica Dr. G. F. Puelles, Facultad de Qumica, Bioqumica y Farmacia, Universidad Nacional de San Luis, Chacabuco y Pedernera, 5700 San Luis (Argentina); Centro Atmico Bariloche, Comisin Nacional de Energa Atmica and Instituto Balseiro, Universidad Nacional de Cuyo, 8400S.C. de Bariloche, Ro Negro (Argentina); Saleta, M.E. [Centro Atmico Bariloche, Comisin Nacional de Energa Atmica and Instituto Balseiro, Universidad Nacional de Cuyo, 8400S.C. de Bariloche, Ro Negro (Argentina); Pedregosa, J.C. [INTEQUI-rea de Qumica General e Inorgnica Dr. G. F. Puelles, Facultad de Qumica, Bioqumica y Farmacia, Universidad Nacional de San Luis, Chacabuco y Pedernera, 5700 San Luis (Argentina); Snchez, R.D. [Centro Atmico Bariloche, Comisin Nacional de Energa Atmica and Instituto Balseiro, Universidad Nacional de Cuyo, 8400S.C. de Bariloche, Ro Negro (Argentina); Alonso, J.A. [Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid (Spain); and others

2014-02-15T23:59:59.000Z

70

Electronic interactions between gold films and mn12-acetate  

E-Print Network (OSTI)

the presence of a surface layer of Mn12acetate, have been performed using a dilution refrigerator. Quantitative fits to the data using the predictions of weak localization theory were performed using a least-squares fit method in order to determine...

Means, Joel Lewis

2009-05-15T23:59:59.000Z

71

Crystal structure of LaMnO[sub 3+[delta  

SciTech Connect

Poly(acrylic acid) (PAA) was used to make a gel from an aqueous solution of lanthanum and manganese nitrates. In the concentration range 3 [times] 10[sup [minus]2] to 5 [times] 10[sup [minus]2] M of PAA, the single phase of perovskite-type LaMnO[sub 3+[delta

Taguchi, Hideki; Yoshioka, Hideaki; Matsuda, Daisuke; Nagao, Mahiko (Okayama Univ. (Japan))

1993-06-01T23:59:59.000Z

72

Interdiffusion in NiMnSb/V/NiMnSb: X-ray and neutron reflectivity investigation of ion beam sputtered trilayer systems  

SciTech Connect

The new trilayer system NiMnSb/V/NiMnSb on MgO(001) was investigated by means of vibrating sample magnetometry (VSM), x-ray, and neutron reflectivity. VSM revealed a coercive field H{sub c}=23 Oe and a hysteresis loop similar to that of an uncoupled ferromagnet. The x-ray and neutron reflectivity data proved that interface roughnesses of 10 {Angstrom} are present. A detailed analysis yielded significant interdiffusion at the NiMnSb/V interfaces which is one possible explanation for the weak magnetoresistance effect measured in similar NiMnSb-based multilayer systems. {copyright} {ital 1999 American Institute of Physics.}

Schlomka, J.; Tolan, M.; Press, W. [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, 24098 Leibnizstrasse 17-19, Kiel (Germany)] [Institut fuer Experimentelle und Angewandte Physik, Christian-Albrechts-Universitaet zu Kiel, 24098 Leibnizstrasse 17-19, Kiel (Germany); Fitzsimmons, M.R. [Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Siebrecht, R. [Institut Laue-Langevin, 38042 Grenoble, Cedex 9 (France)] [Institut Laue-Langevin, 38042 Grenoble, Cedex 9 (France); Schubert, D.W. [GKSS Forschungszentrum, 21502 Geesthacht (Germany)] [GKSS Forschungszentrum, 21502 Geesthacht (Germany); Simon, P. [Max Planck Institut fuer Polymerforschung, 55021 Mainz (Germany)] [Max Planck Institut fuer Polymerforschung, 55021 Mainz (Germany)

1999-11-01T23:59:59.000Z

73

Electrochemical oxidation of Mn(OH){sub 2} in alkaline media  

SciTech Connect

Redox transformations of the Mn(II)/Mn(III) and Mn(II)/Mn(IV) pairs have been studied by transient electrochemical, spectroelectrochemical, and impedance measurements in alkaline solutions at a manganese electrode. The Mn(0)/Mn(II) and Mn(II)/Mn(III) pairs, which have not been clearly identified hitherto in the literature, have been observed using these techniques. A species observed at 285 nm during oxidation of the Mn(OH){sub 2}-covered manganese electrode was assigned to MnOOH. This species eventually led to passive films whose major component is MnO{sub 2} absorbing at about 400 nm. An accumulation of the passive films was observed at longer electrolysis times. Electrochemical impedance measurements were used to construct a Tafel plot for the manganese oxidation. The polarization resistance reached a minimum at about + 0.17 V vs Ag{vert_bar}AgCl (saturated KCl) without oxygen evolution. Some kinetic information including resistance-capacitance time constants for the oxidation reaction and an exchange current density are also reported.

Cha, D.K. [Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry; Park, S.M. [Pohang Univ. of Science and Technology (Korea, Republic of)

1997-08-01T23:59:59.000Z

74

PHYSICAL REVIEW B 84, 205305 (2011) Spin-phonon coupling in single Mn-doped CdTe quantum dot  

E-Print Network (OSTI)

PHYSICAL REVIEW B 84, 205305 (2011) Spin-phonon coupling in single Mn-doped CdTe quantum dot C. L dynamics of a single Mn atom in a laser driven CdTe quantum dot is addressed theoretically. Recent of single Mn-doped CdTe dots, information about the quantum spin state of a single Mn atom is extracted from

Paris-Sud XI, Université de

75

Plutonium Oxidation and Subsequent Reduction by Mn (IV) Minerals  

SciTech Connect

Plutonium sorbed to rock tuff was preferentially associated with manganese oxides. On tuff and synthetic pyrolusite (Mn{sup IV}O{sub 2}), Pu(IV) or Pu(V) was initially oxidized, but over time Pu(IV) became the predominant oxidation state of sorbed Pu. Reduction of Pu(V/VI), even on non-oxidizing surfaces, is proposed to result from a lower Gibbs free energy of the hydrolyzed Pu(IV) surface species versus that of the Pu(V) or Pu(VI) surface species. This work suggests that despite initial oxidation of sorbed Pu by oxidizing surfaces to more soluble forms, the less mobile form of Pu, Pu(IV), will dominate Pu solid phase speciation during long term geologic storage. The safe design of a radioactive waste or spent nuclear fuel geologic repository requires a risk assessment of radionuclides that may potentially be released into the surrounding environment. Geochemical knowledge of the radionuclide and the surrounding environment is required for predicting subsurface fate and transport. Although difficult even in simple systems, this task grows increasingly complicated for constituents, like Pu, that exhibit complex environmental chemistries. The environmental behavior of Pu can be influenced by complexation, precipitation, adsorption, colloid formation, and oxidation/reduction (redox) reactions (1-3). To predict the environmental mobility of Pu, the most important of these factors is Pu oxidation state. This is because Pu(IV) is generally 2 to 3 orders of magnitude less mobile than Pu(V) in most environments (4). Further complicating matters, Pu commonly exists simultaneously in several oxidation states (5, 6). Choppin (7) reported Pu may exist as Pu(IV), Pu(V), or Pu(VI) oxic natural groundwaters. It is generally accepted that plutonium associated with suspended particulate matter is predominantly Pu(IV) (8-10), whereas Pu in the aqueous phase is predominantly Pu(V) (2, 11-13). The influence of the character of Mn-containing minerals expected to be found in subsurface repository environments on Pu oxidation state distributions has been the subject of much recent research. Kenney-Kennicutt and Morse (14), Duff et al. (15), and Morgenstern and Choppin (16) observed oxidation of Pu facilitated by Mn(IV)-bearing minerals. Conversely, Shaughnessy et al. (17) used X-ray Absorption near-edge spectroscopy (XANES) to show reduction of Pu(VI) by hausmannite (Mn{sup II}Mn{sub 2}{sup III}O{sub 4}) and manganite ({gamma}-Mn{sup III}OOH) and Kersting et al., (18) observed reduction of Pu(VI) by pyrolusite (Mn{sup IV}O{sub 2}). In this paper, we attempt to reconcile the apparently conflicting datasets by showing that Mn-bearing minerals can indeed oxidize Pu, however, if the oxidized species remains on the solid phase, the oxidation step competes with the formation of Pu(IV) that becomes the predominant solid phase Pu species with time. The experimental approach we took was to conduct longer term (approximately two years later) oxidation state analyses on the Pu sorbed to Yucca Mountain tuff (initial analysis reported by Duff et al., (15)) and measure the time-dependant changes in the oxidation state distribution of Pu in the presence of the Mn mineral pyrolusite.

KAPLAN, DANIEL

2005-09-13T23:59:59.000Z

76

Effect of Composition and Heat Treatment on MnBi Magnetic Materials  

SciTech Connect

The metallic compound MnBi is a promising rare-earth-free permanent magnet material. Compare to other rare-earth-free candidates, MnBi stands out for its high intrinsic coercivity (Hci) and its large positive temperature coefficient. Several groups have demonstrated that the Hci of MnBi compound in thin film or in powder form can exceed 12 kOe and 26 kOe at 300 K and 523 K, respectively. Such steep increase in Hci with increasing temperature is unique to MnBi. Consequently, MnBi is a highly sought-after hard phase for exchange coupling nanocomposite magnets. The reaction between Mn and Bi is peritectic, so Mn tends to precipitate out of the MnBi liquid during the solidification process. As result, the composition of the Mn-Bi alloy with the largest amount of the desired LTP (low temperature phase) MnBi and highest saturation magnetization will be over-stoichiometric and rich in Mn. The amount of additional Mn required to compensate the Mn precipitation depends on solidification rate: the faster the quench speed, the less Mn precipitates. Here we report a systematic study of the effect of composition and heat treatments on the phase contents and magnetic properties of Mn-Bi alloys. In this study, Mn-Bi alloys with 14 compositions were prepared using conventional metallurgical methods such as arc melting and vacuum heat treatment, and the obtained alloys were analyzed for compositions, crystal structures, phase content, and magnetic properties. The results show that the composition with 55 at.% Mn exhibits the highest LTP MnBi content and the highest magnetization. The sample with this composition shows >90 wt.% LTP MnBi content. Its measured saturation magnetization is 68 emu/g with 2.3 T applied field at 300 K; its coercivity is 13 kOe and its energy product is 12 MGOe at 300 K. A bulk magnet fabricated using this powder exhibits an energy product of 8.2 MGOe.

Cui, Jun; Choi, Jung-Pyung; Polikarpov, Evgueni; Bowden, Mark E.; Xie, Wei; Li, Guosheng; Nie, Zimin; Zarkevich, Nikolai; Kramer, Matthew J.; Johnson, Duane D.

2014-08-17T23:59:59.000Z

77

Electrodeposited Mn-Co Alloy Coating For SOFC Interconnects  

NLE Websites -- All DOE Office Websites (Extended Search)

Electrodeposited Electrodeposited Mn-Co Alloy Coating For SOFC Interconnects H. McCrabb * , T. Hall * , J. Wu # , H. Zhang # , X. Liu # , E.J. Taylor * * Faraday Technology Inc., 315 Huls Dr., Clayton, OH 45315, USA # West Virginia University, Dept. of Mechanical and Aerospace Eng.ESB, Morgantown, WV, 26506, USA Overall Objective Overall Objective Principal Investigator: Heather McCrabb, Company Name: Faraday Technology, Inc., Address: 315 Huls Drive, Clayton, OH 45315, Phone: 937-836-7749, E-mail: heathermccrabb@faradaytechnology.com, Company website: faradaytechnology.com Previous Work at WVU Results Develop an inexpensive manufacturing process for depositing (Mn,Co) 3 O 4 spinel coatings onto SOFC interconnects. Introduction The decrease in the SOFC operating temperatures from 1000°C to between 650 and 850°C has enabled the use of chromia-forming ferritic stainless steels as interconnects

78

Charge transport properties of CdMnTe radiation detectors  

SciTech Connect

Growth, fabrication and characterization of indium-doped cadmium manganese telluride (CdMnTe)radiation detectors have been described. Alpha-particle spectroscopy measurements and time resolved current transient measurements have yielded an average charge collection efficiency approaching 100 %. Spatially resolved charge collection efficiency maps have been produced for a range of detector bias voltages. Inhomogeneities in the charge transport of the CdMnTe crystals have been associated with chains of tellurium inclusions within the detector bulk. Further, it has been shown that the role of tellurium inclusions in degrading chargecollection is reduced with increasing values of bias voltage. The electron transit time was determined from time of flight measurements. From the dependence of drift velocity on applied electric field the electron mobility was found to be n = (718 55) cm2/Vs at room temperature.

Kim K.; Rafiel, R.; Boardman, M.; Reinhard, I.; Sarbutt, A.; Watt, G.; Watt, C.; Uxa, S.; Prokopovich, D.A.; Belas, E.; Bolotnikov, A.E.; James, R.B.

2012-04-11T23:59:59.000Z

79

Magnetic field-induced phase transformation and variant reorientation in Ni2MnGa and NiMnCoIn magnetic shape memory alloys  

E-Print Network (OSTI)

The purpose of this work is to reveal the governing mechanisms responsible for the magnetic field-induced i) martensite reorientation in Ni2MnGa single crystals, ii) stress-assisted phase transformation in Ni2MnGa single crystals and iii) phase...

Karaca, Haluk Ersin

2009-05-15T23:59:59.000Z

80

High-Resolution Mn EXAFS of the Oxygen-Evolving Complex inPhotosystem II: Structural Implications for the Mn4Ca Cluster  

SciTech Connect

The biological generation of oxygen by the oxygen-evolving complex in photosystem II (PS II) is one of natures most important reactions. The recent X-ray crystal structures, while limited by resolutions of 3.2 to 3.5 A, have located the electron density associated with the Mn4Ca complex within the multi-protein PS II complex. Detailed structures critically depend on input from spectroscopic techniques such as EXAFS and EPR/ENDOR, as the XRD resolution does not allow for accurate determination of the position of Mn/Ca or the bridging and terminal ligand atoms. The number and distances of Mn-Mn/Ca/ligand interactions determined from EXAFS provide important constraints for the structure of the Mn cluster. Here we present data from a high-resolution EXAFS method using a novel multi-crystal monochromator that show three short Mn-Mn distances between 2.7 and 2.8 A and hence the presence of three di-mu-oxobridged units in the Mn4Ca cluster. This result imposes clear limitations on the proposed structures based on spectroscopic and diffraction data and provides input for refining such structures.

Yano, Junko; Pushkar, Yulia; Glatzel, Pieter; Lewis, Azul; Sauer,Kenneth; Messinger, Johannes; Bergmann, Uwe; Yachandra, Vittal

2005-09-06T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Synthesis and characterization of pristine Li2MnSiO4 and Li2MnSiO4/C cathode materials for lithium ion batteries  

Science Journals Connector (OSTI)

Pristine Li2MnSiO4 and Li2MnSiO4.../C were both prepared by the solgel method. Citric acid was used as the carbon source. Lithium acetate dihydrate, manganese acetate tetrahydrate, and citric acid were first dis...

Qianqian Zhang; Quanchao Zhuang; Shoudong Xu; Xiangyun Qiu; Yongli Cui; Yueli Shi

2012-05-01T23:59:59.000Z

82

Manganese valence and coordination structure in Mn,Mg-codoped {gamma}-AlON green phosphor  

SciTech Connect

The valence and coordination structure of manganese in a Mn,Mg-codoped {gamma}-AlON spinel-type oxynitride green phosphor were studied by synchrotron X-ray diffraction and absorption fine structure measurements. The absorption edge position of the XANES revealed the bivalency of Mn. Two cation sites are available in the spinel structure for cation doping: a tetrahedral site and an octahedral site. The pre-edge of the XANES and the distance to the nearest neighbor atoms obtained from the EXAFS measurement showed that Mn was situated at the tetrahedral site. Rietveld analysis showed that the vacancy occupied the octahedral site. The preferential occupation of the tetrahedral site by Mn and the roles of N and Mg are discussed in relation to the spinel crystal structure. - Graphical Abstract: Fourier transform of EXAFS of Mn K-edge for Mn,Mg-codoped green phosphor and Mn coordination structure. Highlights: Black-Right-Pointing-Pointer Mn, Mg-codoped {gamma}-AlON green phosphor for white LED. Black-Right-Pointing-Pointer The valence of Mn is divalent. Black-Right-Pointing-Pointer Mn occupies the tetrahedral site in the spinel structure.

Takeda, Takashi, E-mail: TAKEDA.Takashi@nims.go.jp [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Xie, Rong-Jun; Hirosaki, Naoto [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)] [National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Matsushita, Yoshitaka [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [National Institute for Materials Science (NIMS), NIMS-SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Honma, Tetuso [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)] [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)

2012-10-15T23:59:59.000Z

83

Electronic- and band-structure evolution in low-doped (Ga,Mn)As  

SciTech Connect

Modulation photoreflectance spectroscopy and Raman spectroscopy have been applied to study the electronic- and band-structure evolution in (Ga,Mn)As epitaxial layers with increasing Mn doping in the range of low Mn content, up to 1.2%. Structural and magnetic properties of the layers were characterized with high-resolution X-ray diffractometry and SQUID magnetometery, respectively. The revealed results of decrease in the band-gap-transition energy with increasing Mn content in very low-doped (Ga,Mn)As layers with n-type conductivity are interpreted as a result of merging the Mn-related impurity band with the host GaAs valence band. On the other hand, an increase in the band-gap-transition energy with increasing Mn content in (Ga,Mn)As layers with higher Mn content and p-type conductivity indicates the Moss-Burstein shift of the absorption edge due to the Fermi level location within the valence band, determined by the free-hole concentration. The experimental results are consistent with the valence-band origin of mobile holes mediating ferromagnetic ordering in the (Ga,Mn)As diluted ferromagnetic semiconductor.

Yastrubchak, O.; Gluba, L.; ?uk, J. [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland)] [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland); Sadowski, J. [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland) [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland); MAX-Lab, Lund University, 22100 Lund (Sweden); Krzy?anowska, H. [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland) [Institute of Physics, UMCS, Pl. Marii Curie-Sk?odowskiej 1, 20-031 Lublin (Poland); Department of Physics and Astronomy, Vanderbilt University, 6506 Stevenson Center, Nashville, Tennessee 37325 (United States); Domagala, J. Z.; Andrearczyk, T.; Wosinski, T. [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland)] [Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa (Poland)

2013-08-07T23:59:59.000Z

84

Effect of composition and heat treatment on MnBi magnetic materials  

SciTech Connect

The metallic compound MnBi is a promising rare-earth-free permanent magnet material, unique among all candidates for its high intrinsic coercivity (Hci) and its large positive temperature coefficient. The Hci of MnBi in thin-film or powder form can exceed 12 and 26 kOe at 300 and 523 K, respectively. Such a steep rise in Hci with increasing temperature is unique to MnBi. Consequently, MnBi is a highly sought-after hard phase for exchange coupling nanocomposite magnets. However, the reaction between Mn and Bi is peritectic, and hence Mn tends to precipitate out of the MnBi liquid during the solidification process. As result, when the alloy is prepared using conventional induction or arc-melting casting methods, additional Mn is required to compensate the precipitation of Mn. In addition to composition, post-casting annealing plays an important role in obtaining a high content of MnBi low-temperature phase (LTP) because the annealing encourages the Mn precipitates and the unreacted Bi to react, forming the desired LTP phase. Here we report a systematic study of the effect of composition and heat treatments on the phase content and magnetic properties of MnBi alloys. In this study, 14 compositions were prepared using conventional metallurgical methods, and the compositions, crystal structures, phase content and magnetic properties of the resulting alloys were analyzed. The results show that the composition with 55 at.% Mn exhibits both the highest LTP content (93 wt.%) and magnetization (74 emu g?1 with 9 T applied field at 300 K).

Cui, Jun [Pacific Northwest National Laboratory; Choi, Jung-Pyung [Pacific Northwest National Laboratory; Polikarpov, Evgueni [Pacific Northwest National Laboratory; Bowden, Mark E [Pacific Northwest National Laboratory; Xie, Wei [Pacific Northwest National Laboratory; Li, Guosheng [Pacific Northwest National Laboratory; Nie, Zimin [Pacific Northwest National Laboratory; Zarkevich, Nikolai [Ames Laboratory; Kramer, Matthew J [Ames Laboratory; Johnson, Duane [Ames Laboratory

2014-10-01T23:59:59.000Z

85

Effect of a high electric field on the conductivity of MnGa{sub 2}S{sub 4}, MnIn{sub 2}S{sub 4}, and MnGaInS{sub 4} single crystals  

SciTech Connect

The results of studying the effect of a high electric field on the conductivity of MnGa{sub 2}S{sub 4}, MnIn{sub 2}S{sub 4}, and MnGaInS{sub 4} single crystals are reported. The activation energy is determined in high and low electric fields. It is established that the decrease in the activation energy with increasing the external voltage is associated with decreasing the depth of the potential well, in which the electron is located.

Niftiev, N. N. [Azerbaijan State Pedagogical University (Azerbaijan); Tagiev, O. B. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-09-15T23:59:59.000Z

86

Improvement of magnetic properties of FePt nanoparticles by adding Mn  

SciTech Connect

FePtMn nanoparticles were synthesized by the simultaneous reduction of iron acetylacetonate, platinum acetylacetonate, and manganese acetylacetonate with 1,2-hexadecanediol as the reducing reagent in the polyol process. The coercivity of annealed nanoparticles strongly depends on the amount of Mn addition. A maximum coercivity of 19 kOe at room temperature was obtained for (Fe{sub 32}Pt{sub 68}){sub 87}Mn{sub 13} nanoparticles annealed at 700 deg. C for 1 h. The presence of Mn in the FePt L1{sub 0} lattice may induce local strain so the ordering is accelerated. In addition, the high coercivity can presumably be partially related to the local bonding of Pt-Mn (or Fe-Mn) in the L1{sub 0} structure.

Lai, C.-H.; Ho, C.-H. [Department of Materials Science and Engineering, National Tsing Hua University, 300, Hsinchu, Taiwan (China)

2005-05-15T23:59:59.000Z

87

Structure of Al-Mn-Cr-Si quasicrystals studied by pulsed neutron scattering  

Science Journals Connector (OSTI)

The atomic structure of rapidly quenched quasicrystals, Al80Mn20, Al75Mn20Si5, and Al75Mn15Cr5Si5, was studied by pulsed neutron scattering. The pair distribution function was obtained by a direct Fourier transformation of the structure factor, and by assuming isomorphous substitution of Cr for Mn the differential distribution function (DDF) was determined. The addition of Si was found to increase the medium-range order significantly. The DDF from Mn atoms indicates the presence of a quasicrystalline substructure which is occupied both by Mn and Al atoms. The atomic structure of these solids, therefore, is significantly different from that of quasicrystalline Pd58.8U20.6Si20.6.

S. Nanao; W. Dmowski; T. Egami; J. W. Richardson; Jr.; J. D. Jorgensen

1987-01-15T23:59:59.000Z

88

Ge{sub 1-x}Mn{sub x} heteroepitaxial quantum dots: Growth, morphology, and magnetism  

SciTech Connect

Heteroepitaxial Ge{sub 1-x}Mn{sub x} quantum dots (QDs) were grown on Si (001) by molecular beam epitaxial co-deposition, with x = 0 to 0.10, in order to explore the interaction between Mn content, surface morphological evolution, and magnetism. Morphological evolution typical of the Ge/Si (001) system was observed, where the effect of Mn on surface morphology is surprisingly minimal at low Mn content, with no obvious surface morphological indicators of second phase formation. As the Mn content increases, secondary phase formation becomes evident, appearing to heterogeneously nucleate on or within Ge QDs. Still higher Mn concentrations lead to extensive second phase formation interspersed with an array of Ge QDs. Although ferromagnetism up to 220 K is observed, likely arising from intermetallic precipitates, there is no clear evidence for room-temperature ferromagnetism associated with a dilute magnetic solution phase.

Kassim, J.; Nolph, C.; Reinke, P.; Floro, J. [Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States); Jamet, M. [Institut Nanosciences et Cryogenie/SP2M, CEA-UJF, F-38054 Grenoble (France)

2013-02-21T23:59:59.000Z

89

Structural Changes in the Mn(4)Ca Cluster And the Mechanism of Photosynthetic Water Splitting  

SciTech Connect

Photosynthetic water oxidation, where water is oxidized to dioxygen, is a fundamental chemical reaction that sustains the biosphere. This reaction is catalyzed by a Mn{sub 4}Ca complex in the photosystem II (PS II) oxygen-evolving complex (OEC): a multiprotein assembly embedded in the thylakoid membranes of green plants, cyanobacteria, and algae. The mechanism of photosynthetic water oxidation by the Mn{sub 4}Ca cluster in photosystem II is the subject of much debate, although lacking structural characterization of the catalytic intermediates. Biosynthetically exchanged Ca/Sr-PS II preparations and x-ray spectroscopy, including extended x-ray absorption fine structure (EXAFS), allowed us to monitor Mn-Mn and Ca(Sr)-Mn distances in the four intermediate S states, S{sub 0} through S{sub 3}, of the catalytic cycle that couples the one-electron photochemistry occurring at the PS II reaction center with the four-electron water-oxidation chemistry taking place at the Mn{sub 4}Ca(Sr) cluster. We have detected significant changes in the structure of the complex, especially in the Mn-Mn and Ca(Sr)-Mn distances, on the S{sub 2}-to-S{sub 3} and S{sub 3}-to-S{sub 0} transitions. These results implicate the involvement of at least one common bridging oxygen atom between the Mn-Mn and Mn-Ca(Sr) atoms in the O-O bond formation. Because PS II cannot advance beyond the S{sub 2} state in preparations that lack Ca(Sr), these results show that Ca(Sr) is one of the critical components in the mechanism of the enzyme. The results also show that Ca is not just a spectator atom involved in providing a structural framework, but is actively involved in the mechanism of water oxidation and represents a rare example of a catalytically active Ca cofactor.

Pushkar, Y.; Yano, J.; Sauer, K.; Boussac, A.; Yachandra, V.K.

2009-05-21T23:59:59.000Z

90

Single Nanorod Devices for Battery Diagnostics: A Case Study on LiMn2O4  

E-Print Network (OSTI)

correlate well with the better cycling performance of Al-doped LiMn2O4 in our Li-ion battery tests: LiAl0Single Nanorod Devices for Battery Diagnostics: A Case Study on LiMn2O4 Yuan Yang, Chong Xie nanostructure devices as a powerful new diagnostic tool for batteries with LiMn2O4 nanorod materials

Cui, Yi

91

Effect of Zn, Mn, and Fe on Cd accumulation in phytoplankton ...  

Science Journals Connector (OSTI)

We examined the effect of important controlling factors (free ion concentrations of Cd, Zn, and Mn and Fe limitation of growth rate) on Cd accumulation by an...

92

Diluted ferromagnetic semiconductor Li(Zn,Mn)P with decoupled charge and spin doping  

Science Journals Connector (OSTI)

We report the discovery of a diluted magnetic semiconductor, Li(Zn,Mn)P, in which charge and spin are introduced independently via lithium off-stoichiometry and the isovalent substitution of Mn2+ for Zn2+, respectively. Isostructural to (Ga,Mn)As, Li(Zn,Mn)P was found to be a p-type ferromagnetic semiconductor with excess lithium providing charge doping. First-principles calculations indicate that excess Li is favored to partially occupy the Zn site, leading to hole doping. Ferromagnetism with Curie temperature up to 34 K is achieved while the system still shows semiconducting transport behavior.

Z. Deng; K. Zhao; B. Gu; W. Han; J. L. Zhu; X. C. Wang; X. Li; Q. Q. Liu; R. C. Yu; T. Goko; B. Frandsen; L. Liu; Jinsong Zhang; Yayu Wang; F. L. Ning; S. Maekawa; Y. J. Uemura; C. Q. Jin

2013-08-21T23:59:59.000Z

93

Theory of weak localization in ferromagnetic (Ga,Mn)As  

E-Print Network (OSTI)

&M University, College Station, Texas 77843-4242, USA 3Institute of Physics, ASCR, v.v.i., Cukrovarnicka 10, 162 53 Praha 6, Czech Republic 4School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom #1;Received 27 November.... Unlike earlier theoretical work15,16 which ad- dressed quantum interference in ferromagnets, we focus our study on a four-band model which is directly relevant to the valence bands of #1;Ga,Mn#2;As. We demonstrate that the quan- tum interference...

Garate, Ion; Sinova, Jairo; Jungwirth, T.; MacDonald, A. H.

2009-01-01T23:59:59.000Z

94

Surface morphology and magnetic anisotropy in (Ga,Mn)As  

E-Print Network (OSTI)

Atomic Force Microscopy and Grazing incidence X-ray diffraction measurements have revealed the presence of ripples aligned along the $[1\\bar{1}0]$ direction on the surface of (Ga,Mn)As layers grown on GaAs(001) substrates and buffer layers, with periodicity of about 50 nm in all samples that have been studied. These samples show the strong symmetry breaking uniaxial magnetic anisotropy normally observed in such materials. We observe a clear correlation between the amplitude of the surface ripples and the strength of the uniaxial magnetic anisotropy component suggesting that these ripples might be the source of such anisotropy.

S. Piano; X. Marti; A. W. Rushforth; K. W. Edmonds; R. P. Campion; O. Caha; T. U. Schulli; V. Holy; B. L. Gallagher

2010-10-01T23:59:59.000Z

95

Minnesota Innovation Partnerships (MN-IP) Try and Buy MN-IP Try and Buy --for companies interested in licensing existing U of M inventions  

E-Print Network (OSTI)

is executed BUY (LICENSE) · Low, published royalty rate, with first $1 million of product sales royalty-free · Royalty rates based on industry comparables · Royalty rate discount for MN operating companies2 · Royalty

Minnesota, University of

96

Efficient Mn-doped CdS quantum dot sensitized solar cells based on SnO2 microsphere photoelectrodes  

Science Journals Connector (OSTI)

Mn-doped CdS quantum dot sensitized solar cells based on...2...microsphere photoelectrodes are prepared with successive ionic layer adsorption and reaction method. It is found that with Mn-doped CdS quantum dot s...

Lu Liu; Miaoliang Huang; Zhang Lan

2014-02-01T23:59:59.000Z

97

Exchange interaction mediated ferroelectricity in multiferroic MnTiO{sub 3} with anisotropic orbital hybridization and hole delocalization  

SciTech Connect

We present the orbital structure of MnTiO{sub 3} with polarization dependent x-ray absorption and resonant x-ray emission spectra accompanied with electronic structure calculations. The results clearly indicate a strongly anisotropic O 2p-Mn 3d orbital hybridization whereas the Mn 3d hole state shows a highly delocalized characteristic ascribed to the 3d-4p mixing. The extended Mn 4p orbital could enhance the exchange interaction between Mn (3d)-O (2p)-Mn (3d) leading to an asymmetric charge distribution in Mn-O bonds. The delocalized characteristic of Mn 3d holes is indispensable to the mechanism of spin-dependent-metal-ligand hybridization to explain magnetically induced ferroelectricity.

Chen, S. W.; Fu, S. W.; Lee, J. M.; Lee, J. F.; Pao, C. W.; Ishii, H.; Tsuei, K. D.; Hiraoka, N.; Lu, K. T.; Chen, J. M., E-mail: jeng@phys.nthu.edu.tw, E-mail: xiaolin@uow.edu.au, E-mail: jmchen@nsrrc.org.tw [National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China); Lin, P. A. [Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Jeng, H. T., E-mail: jeng@phys.nthu.edu.tw, E-mail: xiaolin@uow.edu.au, E-mail: jmchen@nsrrc.org.tw [Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Chen, D. P.; Dou, S. X.; Wang, X. L., E-mail: jeng@phys.nthu.edu.tw, E-mail: xiaolin@uow.edu.au, E-mail: jmchen@nsrrc.org.tw [Institute for Superconducting and Electronic Materials, Australian Institute of Innovative, Materials, University of Wollongong, North Wollongong, NSW 2500 (Australia)

2014-02-24T23:59:59.000Z

98

Surface characterization of LaMnO{sub 3+{delta}} powder synthesized using poly(acrylic acid)  

SciTech Connect

The La/Mn ratio, specific surface area, and catalytic activity for CO oxidation on perovskite-type LaMnO{sub 3+{delta}} synthesized by firing gels with poly(acrylic acid) (PAA) were measured to characterize the LaMnO{sub 3+{delta}} surface. LaMnO{sub 3+{delta}} synthesized by gel firing with low PAA concentration had a large specific surface area, but a Mn ion content lower than that of LaMnO{sub 3+{delta}} synthesized using acetates. Increasing the PAA concentration or the firing temperature improved the surface state of LaMnO{sub 3+{delta}}. At 5 x 10{sup -2}M PAA, the catalytic activity was better than that of LaMnO{sub 3+{delta}} synthesized using acetates.

Taguchi, Hideki; Yoshioka, Hideaki; Nagao, Mahiko [Okayama Univ. (Japan)

1995-05-01T23:59:59.000Z

99

Magnetic properties changes of MnAs thin films irradiated with highly charged ions  

E-Print Network (OSTI)

transition from hexagonal ( phase) to orthorhombic ( phase, MnP type) is accompanied by a ferromagnetic transition that leads to the - phase coexistence over a large range of temperatures (10­45 C [9Magnetic properties changes of MnAs thin films irradiated with highly charged ions M. Trassinellia

100

Biphasic quantum dots of cubic and hexagonal Mn doped CdS; necessity of Rietveld analysis  

Science Journals Connector (OSTI)

Abstract Mn2+ doped CdS quantum dots (QDs) were prepared via a simple chemical synthesis method. Incorporation of Mn ions into CdS \\{QDs\\} was monitored by structural, magnetic and optical spectroscopy analysis. Although the diffraction patterns seemed to be single wurtzite hexagonal structure, analysis revealed biphasic composite of CdS \\{QDs\\} hexagonal wurtzite and cubic zinc blende. The band gap, crystal phase and the morphology of CdS \\{QDs\\} were found not to be greatly affected by Mn2+ doping, however there was an optimal Mn2+ doping content of 10% where the magnetism is maximum. The recorded photoluminescence (PL) emission spectra, excited at 370nm, depict emission lines in the UV and blue-shift regions. The emission band reveals that the band gap of pure CdS \\{QDs\\} is around 3eV which is greater than that of bulk CdS (2.42eV). The band gap of Mn:CdS \\{QDs\\} is almost independent of Mn content (x) and the crystallite size remains almost the same for all values of x. The observed structural, magnetic and optical properties have been explained on the basis of formation of two phases of CdS doped with Mn. This work aims to highlight recent advances in the synthesis of Mn:CdS diluted magnetic semiconductor quantum dots and their wonderful performance.

Zein K. Heiba; Mohamed Bakr Mohamed; N.G. Imam

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Photopumping of a C iii ultraviolet laser by Mn vi line radiation  

Science Journals Connector (OSTI)

Multiple-pass gain is reported at 2177 and 2163 A? in C iii ions in a vacuum-arc discharge, pumped by Mn vi line radiation from a laser-produced Mn plasma. These Be-like uv lasers pumped by resonant photoexcitation are prototypes for soft x-ray lasers in higher-Z, isoelectronic analogs.

Niansheng Qi and Mahadevan Krishnan

1987-11-02T23:59:59.000Z

102

Processing and optimization of bulk La??[x]Ca[x]MnO?[][delta  

E-Print Network (OSTI)

The following explores the first systematic research conducted at Texas A&M University studying preparation techniques of the bulk La1-x-Cax-Mn-O3"d colossal magnetoresistance (CMR) family. Three sample sets of La1-x-Cax-Mn-O3"d were fabricated...

Ybarra, Ignacio

2013-02-22T23:59:59.000Z

103

Structural, Electrochemical, and Spectroscopic Investigation of Acetate Bridged Dinuclear Tetrakis-Schiff Base Macrocycles of Mn  

E-Print Network (OSTI)

resembling the oxygen-evolving complex (OEC) in photosystem II and dimanganese catalase enzymes, resulting+ and Zn2LAc+ , the two metal centers are bridged by an acetate ligand. [Mn2LAc](ClO4)·(DMF)0.5, [Mn2LAc for substrate molecules bound to redox active metal centers.5-10 In 1970, Robson showed that dinuclear tetrakis

Dinolfo, Peter H.

104

Phase Transition Disappearance in Li1+?Mn2-?O4 Depended on Lithium Excess  

Science Journals Connector (OSTI)

Manganese spinel LiMn2O4 may replace the commercial cathode material, LiCoO2, which is more expensive and toxic. Stoichiometric LiMn2O4 shows a phase transition from cubic (Fd3m) to orthorhombic (Fddd) structure ...

M. Molenda; R. Dziembaj

2002-01-01T23:59:59.000Z

105

Impedance studies of the thin film LiMn2O4/electrolyteinterface  

SciTech Connect

Room-temperature impedance measurements of a thin-film LiMn2O4/LiPF6-EC-DMC interface have been used to identify the spontaneous formation Li2Mn2O4 at the interface at room temperature at voltages of 3.7 and higher. The impedance of the LiMn2O4 films exhibited two time constants: at about 14 kHz and 60 to 200 Hz. The high frequency loop is dependent on film morphology and was attributed to the substrate/oxide interface. The low frequency behavior was dependent on both state-of-charge (SOC) and time at a given SOC. At full charge the impedance in this electrolyte was stable at room temperature over several days. At high lithium contents, film OCV and impedance tended to grow logarithmically with time, with lower rates for lower Mn3+ content in the film. The increased impedance was removed by oxidation of the film to 4.5V vs. Li/Li+. The observations are consistent with a reversible disproportionation of part of the LiMn2O4 into Li2Mn2O4 and a lithium-deficient spinel. With extended constant current cycling part of the Li2Mn2O4 degrades to the Mn2O3 and the process is no longer reversible.

Striebel, Kathryn A.; Sakai, E.; Cairns, Elton J.

2001-04-07T23:59:59.000Z

106

Semimetallic antiferromagnetism in the half-Heusler compound CuMnSb Ruben Weht,2  

E-Print Network (OSTI)

CuMnSb, the first antiferromagnet AFM in the Mn-based class of Heuslers and half-Heuslers that contains several conventional and half metallic ferromagnets, shows a peculiar stability of its magnetic order in high magnetic fields. Density functional based studies reveal an unusual nature of its unstable

Pickett, Warren

107

2013 MnDOT Environmental Stewardship Workshop Transportation Program and Project Development in a Changing Environment  

E-Print Network (OSTI)

in a Changing Environment May 7, 2013 7:30 ­ 8:00 am REGISTRATION and CONTINENTAL BREAKFAST 8:00 ­ 8:15 am of Environmental Stewardship (OES), MnDOT Jon Chiglo, Director, Engineering Services Division, MnDOT 8:15 ­ 8:30 am will review the immediate repair efforts, emergency response coordination, fast track design & letting

Minnesota, University of

108

Tunable White-Light-Emitting Mn-Doped ZnSe Nanocrystals Vijay Kumar Sharma,  

E-Print Network (OSTI)

Tunable White-Light-Emitting Mn-Doped ZnSe Nanocrystals Vijay Kumar Sharma, Burak Guzelturk, Talha report white-light-emitting Mn-doped ZnSe nanocrystals (NCs) that are synthesized using modified orange emission (580 nm), allowed us to achieve excitation wavelength tailorable white-light generation

Demir, Hilmi Volkan

109

Mn-doping-induced itinerant-electron ferromagnetism in Cr2GeC  

Science Journals Connector (OSTI)

The magnetism of the Mn+1AXn phase, Cr2GeC, and its Mn-doped system, (Cr1?xMnx)2GeC (x?0.25), synthesized via a solid state reaction, was investigated systematically. Cr2GeC is in a spin-unpolarized state, but the ferromagnetic band polarization is induced immediately by the Mn doping. The Curie temperature, TC, and the spontaneous moment, ps, increase almost proportionally to the Mn concentration, strongly suggesting that Cr2GeC is located in the vicinity of a ferromagnetic quantum critical point. The strong concentration dependence of peff/ps, where peff is the effective moment in the paramagnetic state, indicates that the ferromagnetism appearing in the Mn-doped Cr2GeC can be classified as a typical itinerant-electron ferromagnetism in a wide range of the degree of electron localization.

Z. Liu; T. Waki; Y. Tabata; H. Nakamura

2014-02-28T23:59:59.000Z

110

Epitaxial growth and ferrimagnetic properties of Mn film on GaSb(100)  

SciTech Connect

We report on the epitaxial stabilization and magnetic properties of Mn films on GaSb(100) using molecular beam epitaxy, a follow-up to our previous work on the growth of Mn films on GaAs(100) [Phys. Rev. B 79, 045309 (2009)]. A strong ferrimagnetic ordering was observed which was attributed to the largely expanded lattice parameter resulting from the lattice mismatch with substrate and the enhanced thermal energy with increasing growth temperature. The observed magnetic moment of 1.16{mu}{sub B}/Mn atom was several times larger than that observed in the Mn/GaAs(100) films due to the lattice constant difference of substrates. The in-plane magnetoresistance behavior demonstrated the magnetic anisotropy that might result from the slightly distorted cubic structure of {alpha}-Mn phase under low-dimensional growth.

Feng Wuwei; Dung, Dang Duc; Shin, Yooleemi; Cho, Sunglae [Department of Physics, University of Ulsan, Ulsan 680-749 (Korea, Republic of); Choi, Jeongyong [IT Convergence Technology Research Laboratory, Electronics and Telecommunications Research Institute, Daejeon 305-700 (Korea, Republic of)

2010-05-15T23:59:59.000Z

111

Giant atomic displacement at a magnetic phase transition in metastable Mn3O4  

SciTech Connect

We present x-ray, neutron scattering, and heat capacity data that reveal a coupled first-order magnetic and structural phase transition of the metastable mixed-valence postspinel compound Mn3O4 at 210 K. Powder neutron diffraction measurements reveal a magnetic structure in which Mn3+ spins align antiferromagnetically along the edge-sharing a axis, with a magnetic propagation vector k = [1/2,0,0]. In contrast, the Mn2+ spins, which are geometrically frustrated, do not order until a much lower temperature. Although the Mn2+ spins do not directly participate in the magnetic phase transition at 210 K, structural refinements reveal a large atomic shift at this phase transition, corresponding to a physical motion of approximately 0.25 angstrom, even though the crystal symmetry remains unchanged. This "giant" response is due to the coupled effect of built-in strain in the metastable postspinel structure with the orbital realignment of the Mn3+ ion.

Hirai, Shigeto [Stanford University; Moreira Dos Santos, Antonio F [ORNL; Shapiro, Max C [Stanford University; Molaison, Jamie J [ORNL; Pradhan, Neelam [ORNL; Guthrie, Malcolm [Carnegie Institution of Washington; Tulk, Christopher A [ORNL; Fisher, Ian R [Stanford University; Mao, Wendy [Stanford University

2013-01-01T23:59:59.000Z

112

Structural and Magnetic Properties of Co-Mn-Sb Thin films  

SciTech Connect

Thin Co-Mn-Sb films of different compositions were investigated and utilized as electrodes in alumina based magnetic tunnel junctions with CoFe counterelectrode. The preparation conditions were optimized with respect to magnetic and structural properties. The Co-Mn-Sb/Al-O interface was analyzed by x-ray absorption spectroscopy and magnetic circular dichroism with particular focus on the element-specific magnetic moments. Co-Mn-Sb crystallizes in different complex cubic structures depending on its composition. The magnetic moments of Co and Mn are ferromagnetically coupled in all cases. A tunnel magnetoresistance ratio of up to 24% at 13 K was found and indicates that Co-Mn-Sb is not a ferromagnetic half-metal. These results are compared to recent works on the structure and predictions of the electronic properties.

Meinert, M.; Schmalhorst, J.-M.; Ebke, D.; Liu, N. N.; Thomas, A.; Reiss, G.; Kanak, J.; Stobiecki, T.; Arenholz, E.

2009-12-17T23:59:59.000Z

113

Magnetism of NiMn2O4-Fe3O4 spinel interfaces  

SciTech Connect

We investigate the magnetic properties of the isostructural spinel-spinel interface of NiMn{sub 2}O{sub 4}(NMO)-Fe{sub 3}O{sub 4}. Although the magnetic transition temperature of the NMO film is preserved, both bulk and interface sensitive measurements demonstrate that the interface exhibits strong interfacial magnetic coupling up to room temperature. While NMO thin films have a ferrimagnetic transition temperature of 60 K, both NiFe{sub 2}O{sub 4} and MnFe{sub 2}O{sub 4} are ferrimagnetic at room temperature. Our experimental results suggest that these magnetic properties arise from a thin interdiffused region of (Fe,Mn,Ni){sub 3}O{sub 4} at the interface, leading to Mn and Ni magnetic properties similar to those of MnFe{sub 2}O{sub 4} and NiFe{sub 2}O{sub 4}.

Arenholz, Elke; Nelson-Cheeseman, B. B.; Chopdekar, R. V.; Bettinger, J. S.; Arenholz, E.; Suzuki, Y.

2007-09-13T23:59:59.000Z

114

Surface characterization of LaMnO{sub 3+{delta}} powder annealed in air  

SciTech Connect

Perovskite-type LaMnO{sub 3+{delta}}, synthesized using poly(acrylic acid) (PAA), was annealed at 400 and 700{degrees}C in air for 6-54 hr. The crystallite size, the specific surface area, the La/Mn ratio, and the catalytic activity of LaMnO{sub 3+{delta}} were measured to characterize the surface. The specific surface area decreased slightly with increasing annealing time, while the La/Mn ratio of the surface, calculated from the XPS measurements, was independent of annealing time. The catalytic activity for the oxidation of CO increased with annealing. These results suggest that annealing improved the crystallinity (regularity of the ions) of the LaMnO{sub 3+{delta}} surface.

Taguchi, H.; Sugita, A.; Nagao, M. [Okayama Univ. (Japan)] [and others] [Okayama Univ. (Japan); and others

1995-10-01T23:59:59.000Z

115

Electronic structure of the molecule-based magnet MnN,,CN...22 from theory and experiment  

E-Print Network (OSTI)

, Louisiana 70118 Received 27 November 2001; published 24 July 2002 The electronic structure of the Mn-based determined recently by Kurmoo and Kepert.2,3 More recently, x-ray structure of the Mn-based material has beenElectronic structure of the molecule-based magnet MnN,,CN...22 from theory and experiment M. R

Liu, Amy Y.

116

Porous Metal-Organic Framework with Coordinatively Unsaturated MnII Sites:Sorption Properties for Various Gases  

E-Print Network (OSTI)

Porous Metal-Organic Framework with Coordinatively Unsaturated MnII Sites:Sorption Properties solid [Mn(NDC)]n (2), which contains coordinatively unsaturated MnII sites, reveals remarkable sorption capabilities for N2, H2, CO2, and CH4 gases and exhibits type I sorption behavior indicative of permanent

Paik Suh, Myunghyun

117

Magnetic phase diagram of magnetoelectric LiMnPO4  

SciTech Connect

The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO4 is studied in fields applied along the a axis. A refinement of the magnetic structure using neutron diffraction data in the SF phase reveals that the spins reorient from being parallel to the a axis to be nearly along the c axis at magnetic fields between 4 and 4.7 T, depending on temperature. The low-field antiferromagnetic phase boundary is shown to join the spin-flop line tangentially at the so-called bicritical point, where there is a suppression of the ordering temperature. At the bicritical field, we observe an increased intensity of the Lorentz broadened elastic scattering at magnetic Bragg peaks above TN as compared to zero field and 10 T, without an increase in peak width. This suggests an increased density of fluctuations at the bicritical field as compared to zero field.

Toft-Petersen, Rasmus; Andersen, Niels H.; Li, Haifeng; Li, Jiying; Tian, Wei; Budko, Serguei L.; Jensen, Thomas B.S.; Niedermayer, Christof; Laver, Mark; Zaharko, Oksana; Lynn, Jeffrey W.; Vaknin, David

2012-06-14T23:59:59.000Z

118

Interfacial studies of a thin-film Li2Mn4O9 electrode  

NLE Websites -- All DOE Office Websites (Extended Search)

Interfacial studies of a thin-film Li2Mn4O9 electrode Interfacial studies of a thin-film Li2Mn4O9 electrode Title Interfacial studies of a thin-film Li2Mn4O9 electrode Publication Type Journal Article Year of Publication 1999 Authors Kostecki, Robert, Fanping Kong, Yoshiaki Matsuo, and Frank R. McLarnon Journal Electrochimica Acta Volume 45 Pagination 225-233 Keywords interfacial films, manganese oxide electrode Abstract A thin-film spinel Li2Mn4O9 electrode was prepared by spin coating onto a Pt substrate. Spectroscopic ellipsometry, X-ray diffraction and current-sensing atomic force microscopy (CSAFM) were used to characterize interfacial processes and film formation at this electrode in the presence of 1.0 M LiPF6, EC:DMC (1:1 by volume) electrolyte. Prolonged exposure of the film to the electrolyte at ambient temperature resulted in spontaneous decomposition of the spinel to λ-MnO2 without disruption of the original structure. The surface of the resulting λ-MnO2 film exhibited no significant change in morphology, however a thin passive electrode surface layer was detected by the CSAFM probe. This electrode surface layer exhibited insulating properties and most likely contained Li2O, a by-product of Li2Mn4O9 decomposition.

119

Ferromagnetism in Mn-Implanted Epitaxially Grown Ge on Si(100)  

SciTech Connect

We have studied ferromagnetism of Mn-implanted epitaxial Ge films on silicon. The Ge films were grown by ultrahigh vacuum chemical vapor deposition using a mixture of germane (GeH{sub 4}) and methylgermane (CH{sub 3}GeH{sub 3}) gases with a carbon concentration of less than 1 at. %, and observed surface rms roughness of 0.5 nm, as measured by atomic force microscopy. Manganese ions were implanted in epitaxial Ge films grown on Si (100) wafers to an effective concentration of 16, 12, 6, and 2 at. %. Superconducting quantum interference device measurements showed that only the three highest Mn concentration samples are ferromagnetic, while the fourth sample, with [Mn] = 2 at. %, is paramagnetic. X-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements indicate that localized Mn moments are ferromagnetically coupled below the Curie temperature. Isothermal annealing of Mn-implanted Ge films with [Mn] = 16 at. % at 300 C for up to 1200 s decreases the magnetization but does not change the Curie temperature, suggesting that the amount of the magnetic phase slowly decreases with time at this anneal temperature. Furthermore, transmission electron microscopy and synchrotron grazing incidence x-ray diffraction experiments show that the Mn-implanted region is amorphous, and we believe that it is this phase that is responsible for the ferromagnetism. This is supported by our observation that high-temperature annealing leads to recrystallization and transformation of the material into a paramagnetic phase.

Guchhait, S.; Jamil, M.; Ohldag, H.; Mehta, A.; Arenholz, E.; Lian, G.; Li Fatou, A.; Ferrer, D. A.; Markert, J. T.; Colombo, L.; Banerjee, S. K.

2011-01-05T23:59:59.000Z

120

Ferrimagnetism and disorder of epitaxial Mn2-xCoxVAl Heusler compound thin films  

SciTech Connect

The quaternary full Heusler compound Mn{sub 2-x}Co{sub x}VAl with x = 1 is predicted to be a half-metallic antiferromagnet. Thin films of the quaternary compounds with x = 0-2 were prepared by dc and RF magnetron co-sputtering on heated MgO (0 0 1) substrates. The magnetic structure was examined by x-ray magnetic circular dichroism and the chemical disorder was characterized by x-ray diffraction. Ferrimagnetic coupling of V to Mn was observed for Mn{sub 2}VAl (x = 0). For x = 0.5, we also found ferrimagnetic order with V and Co antiparallel to Mn. The observed reduced magnetic moments are interpreted with the help of band structure calculations in the coherent potential approximation. Mn{sub 2}VAl is very sensitive to disorder involving Mn, because nearest-neighbour Mn atoms couple antiferromagnetically. Co{sub 2}VAl has B2 order and has reduced magnetization. In the cases with x {ge} 0.9 conventional ferromagnetism was observed, closely related to the atomic disorder in these compounds.

Meinert, Markus; Schmalhorst, Jan-Michael; Reiss, Gunter; Arenholz, Elke

2011-01-29T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Framework-incorporated Mn and Co analcime zeolites: Synthesis and characterization  

SciTech Connect

The framework-substituted cobalt and manganese analcime zeolites were synthesized via a direct hydrothermal approach. The obtained samples were characterized by XRD powder, SEM-EDX, nitrogen physical adsorption, Raman microscopy, diffuse reflectance UV-Vis and IR spectroscopy which complementarily demonstrated the incorporation of cobalt and manganese into the zeolites framework. The results showed that substitution of Mn and Co could be placed in two synthesis gels with same compositions containing Al/Mn=5 and Al/Co=4 mol ratios, respectively. In addition, with replacing Al with Mn and synthesis of Mn-modified analcime, zeolite with higher surface area and pore volume could be achieved than the Co modified analcime. - Graphical abstract: The images and adsorption-desorption isotherms of N{sub 2} at 77 K for (a) Co (b) Mn modified analcime. Highlights: Black-Right-Pointing-Pointer Synthesis of Co and Mn modified analcime for the first time. Black-Right-Pointing-Pointer Framework-incorporation of Co and Mn using the same silicate gel composition. Black-Right-Pointing-Pointer Applying several techniques to provide proofs for the characterization.

Azizi, Seyed Naser, E-mail: azizi@umz.ac.ir [Analytical Division, Faculty of Chemistry, University of Mazandaran, P.O. Box 47416-95447, Babolsar (Iran, Islamic Republic of); Ehsani Tilami, Salma [Analytical Division, Faculty of Chemistry, University of Mazandaran, P.O. Box 47416-95447, Babolsar (Iran, Islamic Republic of)] [Analytical Division, Faculty of Chemistry, University of Mazandaran, P.O. Box 47416-95447, Babolsar (Iran, Islamic Republic of)

2013-02-15T23:59:59.000Z

122

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ  

SciTech Connect

The microbial catalysis of Mn(II) oxidation is believed to be a dominant source of abundant sorption- and redox-active Mn oxides in marine, freshwater, and subsurface aquatic environments. In spite of their importance, environmental oxides of known biogenic origin have generally not been characterized in detail from a structural perspective. Hyporheic zone Mn oxide grain coatings at Pinal Creek, Arizona, a metals-contaminated stream, have been identified as being dominantly microbial in origin and are well studied from bulk chemistry and contaminant hydrology perspectives. This site thus presents an excellent opportunity to study the structures of terrestrial microbial Mn oxides in detail. XRD and EXAFS measurements performed in this study indicate that the hydrated Pinal Creek Mn oxide grain coatings are layer-type Mn oxides with dominantly hexagonal or pseudo-hexagonal layer symmetry. XRD and TEM measurements suggest the oxides to be nanoparticulate plates with average dimensions on the order of 11 nm thick x 35 nm diameter, but with individual particles exhibiting thickness as small as a single layer and sheets as wide as 500 nm. The hydrated oxides exhibit a 10-A basal-plane spacing and turbostratic disorder. EXAFS analyses suggest the oxides contain layer Mn(IV) site vacancy defects, and layer Mn(III) is inferred to be present, as deduced from Jahn-Teller distortion of the local structure. The physical geometry and structural details of the coatings suggest formation within microbial biofilms. The biogenic Mnoxides are stable with respect to transformation into thermodynamically more stable phases over a time scale of at least 5 months. The nanoparticulate layered structural motif, also observed in pure culture laboratory studies, appears to be characteristic of biogenic Mn oxides and may explain the common occurrence of this mineral habit in soils and sediments.

Bargar, John; Fuller, Christopher; Marcus, Matthew A.; Brearley, Adrian J.; Perez De la Rosa, M.; Webb, Samuel M.; Caldwell, Wendel A.

2008-03-19T23:59:59.000Z

123

DAFS study of site-specific local structure of Mn in manganese ferrite films.  

SciTech Connect

Manganese ferrite (MnFe{sub 2}O{sub 4}) is a well-known magnetic material widely used in electronics for many years. It is well established that its magnetic behavior is strongly influenced by local structural properties of Mn ions, which are distributed between crystallographically inequivalent tetrahedral and octahedral sites in the unit cell. In order to understand and be able to tune properties of these structures, it is necessary to have detailed site-specific structural information on the system. Here we report on the application of diffraction-anomalous fine structure (DAFS) spectroscopy to resolve site-specific Mn local structures in manganese ferrite films. The DAFS measurements were done at undulator beamline 4-ID-D of the Advanced Photon Source at Argonne National Laboratory. The DAFS spectra (Fig. 1) were measured at several Bragg reflections in the vicinity of the Mn absorption K-edge, having probed separately contributions from tetrahedrally and octahedrally coordinated Mn sites. The DAFS data analysis done with an iterative Kramers-Kroenig algorithm made it possible to solve separately the local structure around different inequivalent Mn sites in the unit cell. The reliability of the data treatment was checked carefully, and it was showed that the site-specific structural parameters obtained with DAFS allow us to describe fluorescence EXAFS spectrum measured independently. Fig. 2 shows individual site contributions to the imaginary part of the resonant scattering amplitude obtained from the treatment of the data of Fig. 1. The analysis of the refined site-specific absorption spectra was done using EXAFS methods based on theoretical standards. We provided direct evidence for the tetrahedral Mn-O bond distance being increased relative to the corresponding Fe-O distance in bulk manganese ferrites. The first coordination shell number was found to be reduced significantly for Mn atoms at these sites. This finding is consistent with the well-known tendency of Mn to be tetrahedrally coordinated in these compounds.

Kravtsov, E.; Haskel, D.; Cady, A.; Yang, A.; Vittoria, C.; Zuo, X.; Harris, V. G.; X-Ray Science Division; Inst. of Metal Physics; Northeastern Univ.; Nankai Univ.

2006-01-01T23:59:59.000Z

124

Quantum interference in exciton-Mn spin interactions in a CdTe semiconductor quantum dot  

E-Print Network (OSTI)

We show theoretically and experimentally the existence of a new quantum interference(QI) effect between the electron-hole interactions and the scattering by a single Mn impurity. Theoretical model, including electron-valence hole correlations, the short and long range exchange interaction of Mn ion with the heavy hole and with electron and anisotropy of the quantum dot, is compared with photoluminescence spectroscopy of CdTe dots with single magnetic ions. We show how design of the electronic levels of a quantum dot enable the design of an exciton, control of the quantum interference and hence engineering of light-Mn interaction.

Trojnar, A; Kadantsev, E; Hawrylak, P; Goryca, M; Kazimierczuk, T; Kossacki, P; Wojnar, P; Potemski, M

2011-01-01T23:59:59.000Z

125

Quantum interference in exciton-Mn spin interactions in a CdTe semiconductor quantum dot  

E-Print Network (OSTI)

We show theoretically and experimentally the existence of a new quantum interference(QI) effect between the electron-hole interactions and the scattering by a single Mn impurity. Theoretical model, including electron-valence hole correlations, the short and long range exchange interaction of Mn ion with the heavy hole and with electron and anisotropy of the quantum dot, is compared with photoluminescence spectroscopy of CdTe dots with single magnetic ions. We show how design of the electronic levels of a quantum dot enable the design of an exciton, control of the quantum interference and hence engineering of light-Mn interaction.

A. Trojnar; M. Korkusinski; E. Kadantsev; P. Hawrylak; M. Goryca; T. Kazimierczuk; P. Kossacki; P. Wojnar; M. Potemski

2011-05-04T23:59:59.000Z

126

Anomalous Stoichiometry Layered Structure and Magnetic Ordering of the Prussian Blue Analog [NEt4]2MnII3(CN)8  

SciTech Connect

Atypical of Prussian blue structured materials, Mn{sup II} and [NEt{sub 4}]CN react to form [NEt{sub 4}]{sub 2}Mn{sub 3}(CN){sub 8} possessing layers of octahedral [Mn{sup II}(CN){sub 6}]{sup 4-} bonded to two high-spin tetrahedral Mn{sup II} sites.

J Her; P Stephens; C Kareis; J Moore; J Miller

2011-12-31T23:59:59.000Z

127

Structural, Optical and Magnetic Properties of Mn-doped CdS Diluted Magnetic Semiconductor Nanoparticles  

Science Journals Connector (OSTI)

Diluted magnetic CdS:Mn nanoparticles were synthesized by the aqueous...2+) concentrations (x...=710atom%) at room temperature in nitrogen atmosphere and capped with Thiogelycerol. The X-ray diffraction patter...

S. Salimian; S. Farjami Shayesteh

2012-08-01T23:59:59.000Z

128

MnO2-Based Electrochemical Supercapacitors on Flexible Carbon Substrates  

Science Journals Connector (OSTI)

Manganese dioxide films were grown on large area flexible carbon aerogel substrates. Characterization by x-ray diffraction confirmed ?-MnO2 growth. Three types of films were compared as a function of hexamethylen...

Marko J. Tadjer; Michael A. Mastro; Jos M. Rojo

2014-04-01T23:59:59.000Z

129

Electrode Characteristics of Individual, MnO2 Coated Carbon Nanotubes  

E-Print Network (OSTI)

MnO2 Coated Carbon Nanotubes Brad L. Corso, Israel Perez,single- walled carbon nanotubes. Li ion cyclic voltammetrysingle-walled carbon nanotubes (SWNTs) that are grown in

Collins, Philip G

2011-01-01T23:59:59.000Z

130

Zeolite-encapsulated Mn(II) complexes as catalysts for selective alkene oxidation  

Science Journals Connector (OSTI)

... , Space-filling molecular model (top and side view) (using the program Hyperchem from Autodesk Inc.) of c/s-[Mn(bpy)2]2+-Y (structure derived from ...

Peter-Paul Knops-Gerrits; Dirk De Vos; Frdric Thibault-Starzyk; Pierre A. Jacobs

1994-06-16T23:59:59.000Z

131

Synthesis and Luminescence of ZnMgS:Mn2+ Nanoparticles. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

of green light emitting diodes. Citation: Zhang J, F Su, W Chen, R Sammynaiken, SL Westcott, DE McCready, G Li, and AG Joly.2005."Synthesis and Luminescence of ZnMgS:Mn2+...

132

LiCoO2-and LiMn2O4-based composite cathode materials  

Science Journals Connector (OSTI)

We have prepared composite cathode materials based on two electrochemically active compounds, LiCoO2 and LiMn2O4..., and investigated their properties. The results indicate that the discharge capacities of all th...

Ya. V. Shatilo; E. V. Makhonina; V. S. Pervov; V. S. Dubasova

2006-07-01T23:59:59.000Z

133

Understanding and development of combined acoustic and magnetic actuation of Ni?MnGa single crystals  

E-Print Network (OSTI)

Ni-Mn-Ga based ferromagnetic shape memory alloys (FSMAs) have emerged as a promising new class of active materials capable of producing a large (several %) magnetic-field-induced strain (MFIS). FSMAs still have several ...

Techapiesancharoenkij, Ratchatee, 1979-

2007-01-01T23:59:59.000Z

134

Frequency Response of Acoustic-Assisted NiMnGa Ferromagnetic- Shape-Memory-Alloy Actuator  

E-Print Network (OSTI)

A prototype of NiMnGa based ferromagnetic-shape-memory-alloy (FSMA) actuator was designed and built; an acoustic-assist technique was applied to the actuator to enhance its performance. A piezoelectric stack actuator was ...

Techapiesancharoenkij, Ratchatee

135

Magnetism of NiMn2O4-Fe3O4 spinel interfaces  

E-Print Network (OSTI)

Magnetism of NiMn 2 O 4 Fe 3 O 4 spinel interfaces B. B.2. Element-specific magnetism of Fe 3 O 4 /NMO interface inin these structures, 6 the magnetism near the isostructural

Nelson-Cheeseman, B. B.

2007-01-01T23:59:59.000Z

136

CSS and Complete Streets Partnering with Mn/DOT for Complete Streets  

E-Print Network (OSTI)

Examples #12;·! Interrelated conditions in which something exists ·! Tying parts together to work Initiative: Seeks to integrate CSS in Mn/DOT as a business model to improve our processes and to balance

Minnesota, University of

137

Rusting Evolution of MnCuP Weathering Steel Submitted to Simulated Industrial Atmospheric Corrosion  

Science Journals Connector (OSTI)

The rusting evolution of MnCuP weathering steel in a simulated industrial atmosphere as a...?-FeOOH. During the second corrosion stage, a compact and protective inner rust layer forms with a higher relative abund...

Long Hao; Sixun Zhang; Junhua Dong; Wei Ke

2012-05-01T23:59:59.000Z

138

Direct production of light olefins from syngas over potassium modified FeMn catalyst  

Science Journals Connector (OSTI)

A series of potassium promoted FeMn catalysts for light olefin synthesis from CO hydrogenation were prepared by the co-precipitation-calcination-impregnation method. The impact of potassium promoter on the te...

Jiang-Bing Li; Hong-Fang Ma; Hai-Tao Zhang

2014-08-01T23:59:59.000Z

139

Single-molecule magnets assembled from oxime stabilized Mn?III triangles  

E-Print Network (OSTI)

tunneling in the single- molecule magnet Mn-12-acetate.and Brechin, E. K. , A Single-Molecule Magnet with a "Twist"Anisotropy Barrier for a Single- Molecule Magnet, Journal of

Stephenson, Casey Justin

2009-01-01T23:59:59.000Z

140

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system have been explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering (LSMS) method to explore the magnetic states responsible for the magnet-caloric effect in this material. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy were investigated using differential scanning calorimetry (DSC) and superconducting quantum interference device (SQUID). Neutron scattering experiments were performed to observe the structural and magnetic phase transformations at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) on alloys of Ni-Mn-Ga and Ni-Mn-Ga-Cu-Fe. Data from the observations are discussed in comparison with the computational studies.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Sefat, A. S. [Oak Ridge National Laboratory (ORNL); Rusanu, Aurelian [ORNL; Evans III, Boyd Mccutchen [ORNL

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

External Electric Field Catalyzed N2O Decomposition on Mn-Embedded Graphene  

Science Journals Connector (OSTI)

External Electric Field Catalyzed N2O Decomposition on Mn-Embedded Graphene ... Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, Changchun 130022, China ...

E. H. Song; J. M. Yan; J. S. Lian; Q. Jiang

2012-09-05T23:59:59.000Z

142

Formation of nano-crystalline todorokite from biogenic Mn Xiong Han Feng a,1  

E-Print Network (OSTI)

Formation of nano-crystalline todorokite from biogenic Mn oxides Xiong Han Feng a,1 , Mengqiang Zhu oxides in the environment. Additionally this method may be a viable biosynthesis route for porous, nano

Sparks, Donald L.

143

Structural and Magnetic Properties of Epitaxial MnSi(111) Thin Films.  

E-Print Network (OSTI)

??MnSi(111) films were grown on Si(111) substrates by solid phase epitaxy (SPE) and molecular beam epitaxy (MBE) to determine their magnetic structures. A lattice mismatch (more)

Karhu, Eric

2012-01-01T23:59:59.000Z

144

Mn solid solutions in self-assembled Ge/Si (001) quantum dot heterostructures  

SciTech Connect

Heteroepitaxial Ge{sub 0.98}Mn{sub 0.02} quantum dots (QDs) on Si (001) were grown by molecular beam epitaxy. The standard Ge wetting layer-hut-dome-superdome sequence was observed, with no indicators of second phase formation in the surface morphology. We show that Mn forms a dilute solid solution in the Ge quantum dot layer, and a significant fraction of the Mn partitions into a sparse array of buried, Mn-enriched silicide precipitates directly underneath a fraction of the Ge superdomes. The magnetic response from the ultra-thin film indicates the absence of robust room temperature ferromagnetism, perhaps due to anomalous intermixing of Si into the Ge quantum dots.

Kassim, J.; Nolph, C.; Reinke, P.; Floro, J. [Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States); Jamet, M. [Institut Nanosciences et Cryogenie/SP2M, CEA-UJF, F-38054 Grenoble (France)

2012-12-10T23:59:59.000Z

145

Building of a Novel Mn12 Single Molecule Magnet by Assembly of Anisotropic  

NLE Websites -- All DOE Office Websites (Extended Search)

Building of a Novel Mn12 Single Building of a Novel Mn12 Single Molecule Magnet by Assembly of Anisotropic Triangles Building of a Novel Mn12 Single Molecule Magnet by Assembly of Anisotropic Triangles Print Wednesday, 06 July 2011 12:58 Assembly of triangular {MnIII3(O)(salox)3}+ fragments mediated by azido ligands, results in the dodecanuclear [Mn12O4(salox)12(N3)4(MeOH)4(H2O)2] complex with S = 8 ground state and SMM response. After the discovery of the Single-Molecule-Magnet (SMM) behaviour of [Mn6(O)2(salox)6(R-COO)2] (salox = salicylaldoxime, R = Me, Ph) complexes in 2004,1 the chemistry of this family of [Mn6] clusters has been studied in depth: the systematic change of the carboxylato ligands, the study of substitutedR-saloxH2 related ligands,2 the effect of variation of the oxidation state,3 the response under pressure4 or the one-dimensional assembly of [Mn6] units into chains of clusters5 with Single-Chain-Magnet behaviour in some cases,5c,d turn this system into one of the best known in the SMM field. One of the main goals of this work, developed by Brechin et al. has been to modulate the value of the ground spin level, reaching the maximum possible spin S = 12 by means of the adequate choice of methyl or ethyl substituted salicylaldoximes and the understanding of the structural features that control the coupling inside the triangles. Article Link (PDF)

146

(In,Mn)As quantum dots: Molecular-beam epitaxy and optical properties  

SciTech Connect

Self-assembled (In,Mn)As quantum dots are synthesized by molecular-beam epitaxy on GaAs (001) substrates. The experimental results obtained by transmission electron microscopy show that doping of the central part of the quantum dots with Mn does not bring about the formation of structural defects. The optical properties of the samples, including those in external magnetic fields, are studied.

Bouravleuv, A. D., E-mail: bour@mail.ioffe.ru; Nevedomskii, V. N. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Ubyivovk, E. V. [St. Petersburg State University (Russian Federation)] [St. Petersburg State University (Russian Federation); Sapega, V. F. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Khrebtov, A. I. [St. Petersburg Academic University, Nanotechnology Research and Education Centre (Russian Federation)] [St. Petersburg Academic University, Nanotechnology Research and Education Centre (Russian Federation); Samsonenko, Yu. B.; Cirlin, G. E.; Ustinov, V. M. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)

2013-08-15T23:59:59.000Z

147

DC electrodeposition of MnCo alloys on stainless steels for SOFC interconnect application  

SciTech Connect

High conductivity coatings that resist oxide scale growth and reduce chromium evaporation are needed to make stainless steel interconnect materials viable for long-term stable operation of solid oxide fuel cells (SOFC). Mn1.5Co1.5O4 spinel is one of the most promising coatings for interconnect application because of its high conductivity, good chromium retention capability, as well as good CTE match to ferritic stainless steels. MnCo electrodeposition followed by oxidization is potentially a low cost method for fabrication of (Mn,Co)3O4 spinel coatings. This work looks at the co-deposition of MnCo alloys for this application. As a guide to optimize the deposition process, characterizations of the cathodic reactions and reaction potentials are done using polarization curves. It was found that as cobalt concentration was varied that the alloy composition became richer in cobalt, indicating that the deposition is regular co-deposition process. It was also found that at 0.05M Co concentration in excess gluconate the MnCo alloys composition could be tuned by varying the current density. Coatings with MnCo around 1:1 could be obtained at a current density of 250 mA/cm2. However, the higher potential increased hydrogen production making the films more porous. Oxidation of the alloy coatings showed that much of the porosities could be eliminated during oxidation. It was found in a number of samples that fully dense coatings where obtained. The composition of the oxidized coating was found to become enriched in Mn, possibly due to the Mn fast diffusion from the substrate.

Wu, Junwei; Jiang, Yinglu; Johnson, Christopher; Liu, Xingbo

2008-03-01T23:59:59.000Z

148

Effect of magnetic field and temperature on the ferroelectric loop in MnWO4  

Science Journals Connector (OSTI)

The ferroelectric properties of MnWO4 single crystal have been investigated. Despite a relatively low remanent polarization, we show that the sample is ferroelectric. The shape of the ferroelectric loop of MnWO4 strongly depends on magnetic field and temperature. While its dependence does not directly correlate with the magnetocapacitance effect before the paraelectric transition, the effect of magnetic field on the ferroelectric polarization loop supports magnetoelectric coupling.

Bohdan Kundys; Charles Simon; Christine Martin

2008-05-12T23:59:59.000Z

149

Mn, Fe, Zn and As speciation in a fast-growing ferromanganese marine nodule  

SciTech Connect

The speciation of Mn, Fe, As and Zn in a fast-growing (0.02mm/yr), shallow-marine ferromanganese nodule has been examined by micro X-ray fluorescence, micro X-ray diffraction, and micro X-ray absorption spectroscopy. This nodule exhibits alternating Fe-rich and Mn-rich layers reflecting redox variations in water chemistry. Fe occurs as two-line ferrihydrite. The As is strictly associated with Fe and is mostly pentavalent, with an environment similar to that of As sorbed on or coprecipitated with synthetic ferrihydrite. The Mn is in the form of turbostratic birnessite with {approx} 10 percent trivalent manganese in the layers and probably {approx} 8 percent corner-sharing metal octahedra in the interlayers. The Zn is enriched on the rim of the nodule, associated with Mn. The Zn is completely (>90 percent) tetrahedrally coordinated and sorbed in the interlayers of birnessite on vacant layer Mn sites. The Zn and Mn species are similar to ones found in soils, suggesting common structural principles, despite the differing formation conditions in these systems.

Marcus, Matthew A.; Manceau, Alain; Kersten, Michael

2004-04-01T23:59:59.000Z

150

Magnetic properties and loss separation in iron-silicone-MnZn ferrite soft magnetic composites  

SciTech Connect

This paper investigates the magnetic and structural properties of iron-based soft magnetic composites coated with silicone-MnZn ferrite hybrid. The organic silicone resin was added to improve the flexibility of the insulated iron powder and causes better adhesion between particles to increase the mechanical properties. Scanning electron microscopy and distribution maps show that the iron particle surface is covered with a thin layer of silicone-MnZn ferrite. Silicone-MnZn ferrite coated samples have higher permeability when compared with the non-magnetic silicone resin coated compacts. The real part of permeability increases by 34.18% when compared with the silicone resin coated samples at 20 kHz. In this work, a formula for calculating the total loss component by loss separation method is presented and finally the different parts of total losses are calculated. The results show that the eddy current loss coefficient is close to each other for the silicone-MnZn ferrite, silicone resin and MnZn ferrite coated samples (0.0078MnZn ferrite coated sample (k{sub 2} =1.4058) in comparison with other samples.

Wu, Shen; Sun, Aizhi; Xu, Wenhuan; Zou, Chao; Yang, Jun; Dong, Juan [School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing (China)

2013-12-16T23:59:59.000Z

151

Electronic structure and ferromagnetism of Mn-doped group-IV semiconductors  

Science Journals Connector (OSTI)

Accurate ab initio full-potential augmented plane wave (FLAPW) electronic calculations within density functional theory in both local density and generalized gradient approximations have been performed for MnxGe1-x and MnxSi1-x ordered alloys, focusing on their electronic and magnetic properties as a function of the host semiconducting matrix (i.e., Si vs Ge), the Mn concentration, and the spin magnetic alignment (i.e., ferromagnetic vs antiferromagnetic). As expected, Mn is found to be a source of holes and localized magnetic moments of about 3?B/Mn. The results show that irrespective of the Mn content, the Ge-based systems are very close to half-metallicity, whereas the Si-based structures just miss the half-metallic behavior due to the crossing of the Fermi level by the lowest conduction bands. Moreover, the ferromagnetic alignment is favored compared to the antiferromagnetic one, with its stabilization generally increasing with Mn content; this is in agreement with recent experimental findings for MnGe systems and supports the view that this class of ferromagnetic semiconductors constitute basic spintronic materials.

A. Stroppa; S. Picozzi; A. Continenza; A. J. Freeman

2003-10-08T23:59:59.000Z

152

Calcium EXAFS establishes the Mn-Ca cluster in the oxygen-evolving complex of Photosystem II  

SciTech Connect

The proximity of Ca to the Mn cluster of the photosynthetic water-oxidation complex is demonstrated by X-ray absorption spectroscopy. We have collected EXAFS data at the Ca K-edge using active PS II membrane samples that contain approximately 2 Ca per 4 Mn. These samples are much less perturbed than previously investigated Sr-substituted samples, which were prepared subsequent to Ca depletion. The new Ca EXAFS clearly shows backscattering from Mn at 3.4 angstroms, a distance that agrees with that surmised from previously recorded Mn EXAFS. This result is also consistent with earlier related experiments at the Sr K-edge, using samples that contained functional Sr, that show Mn is {approx}; 3.5 angstroms distant from Sr. The totality of the evidence clearly advances the notion that the catalytic center of oxygen evolution is a Mn-Ca heteronuclear cluster.

Cinco, Roehl M.; McFarlane Holman, Karen L.; Robblee, John H.; Yano, Junko; Pizarro, Shelly A.; Bellacchio, Emanuele; Sauer, Kenneth; Yachandra, Vittal K.

2002-08-02T23:59:59.000Z

153

Mixed-Phase Oxide Catalyst Based on Mn-Mullite (Sm, Gd)Mn2O5 for NO Oxidation in Diesel Exhaust  

Science Journals Connector (OSTI)

...step of the reaction cycle, O 2 gas molecules decompose...available for the next cycle of NO conversion...ramp-up and ramp-down cycles. Four key factors contribute...performs in simulated diesel exhaust, we added MnCe-7...R. J. Farrauto, Fundamentals of Industrial Catalytic...

Weichao Wang; Geoffrey McCool; Neeti Kapur; Guang Yuan; Bin Shan; Matt Nguyen; Uschi M. Graham; Burtron H. Davis; Gary Jacobs; Kyeongjae Cho; Xianghong (Kelly) Hao

2012-08-17T23:59:59.000Z

154

Peculiarly strong room-temperature ferromagnetism from low Mn-doping in ZnO grown by molecular beam epitaxy  

SciTech Connect

Strong room-temperature ferromagnetism is demonstrated in single crystalline Mn-doped ZnO thin films grown by molecular beam epitaxy. Very low Mn doping concentration is investigated, and the measured magnetic moment is much larger than what is expected for an isolated ion based on Hund's rules. The ferromagnetic behavior evolves with Mn concentration. Both magnetic anisotropy and anomalous Hall effect confirm the intrinsic nature of ferromagnetism. While the Mn dopant plays a crucial role, another entity in the system is needed to explain the observed large magnetic moments.

Zuo Zheng; Morshed, Muhammad; Liu Jianlin [Quantum Structures Laboratory, Department of Electrical Engineering, University of California at Riverside, Riverside, California 92521 (United States); Beyermann, W. P. [Department of Physics and Astronomy, University of California at Riverside, Riverside, California 92521 (United States); Zheng Jianguo [Laboratory for Electron and X-ray Instrumentation, California Institute for Telecommunications and Information Technology, University of California Irvine, Irvine, California 92697 (United States); Xin Yan [NHMFL, Florida State University, 1800 E. Paul Dirac Dr., Tallahassee, FL 32310-3706 (United States)

2013-03-15T23:59:59.000Z

155

The geochemical evolution of the Sonju Lake intrusion: assimilation and fractional crystallization in a layered mafic intrusion near Finland, Mn.  

E-Print Network (OSTI)

??The Sonju Lake Intrusion, located within the Beaver Bay Complex near Finland, MN, is the most completely differentiated intrusion related to the Midcontinent Rift System (more)

Dayton, Ryan N.

2011-01-01T23:59:59.000Z

156

Effect of K and Ca on catalytic activity of Mn-CeO x /Ti-PILC  

Science Journals Connector (OSTI)

Mn-CeO x /Ti-pillared clay (PILC) is an attractive catalyst for selective catalytic... x at low temperature because of its low cost. The poison...

Boxiong Shen; Lidan Deng; Jianhong Chen

2013-08-01T23:59:59.000Z

157

Enhanced ferromagnetic order in Sr{sub 4}Mn{sub 3}O{sub 3}(GeO{sub 4}){sub 3} featuring canted [MnO{sub 4}]{sub ?} spin chains of mixed-valent Mn(III)/Mn(IV). Aliovalent substitution of the Sr{sub 4?x}Ln{sub x}Mn{sup III}{sub 2+x}Mn{sup IV}{sub 1?x}O{sub 3}(GeO{sub 4}){sub 3} solid-solution  

SciTech Connect

Crystals of Sr{sub 4?x}Ln{sub x}Mn{sub 3}O{sub 3}(GeO{sub 4}){sub 3} (x=0; x?0.15 for Ln=La, Pr, Nd, Sm. Eu, Gd, Dy; x?0.3 for Ln=Gd) were isolated upon using high-temperature, solid-state methods in molten-salt media. These compounds are isostructural with the previously reported Na{sub 3}LnMn{sub 3}O{sub 3}(AsO{sub 4}){sub 3} (Ln=La, Sm, Gd) series that contains the same [MnO{sub 4}]{sub ?} spin chains. The synthesis of the Sr{sub 4}Mn{sub 3}O{sub 3}(GeO{sub 4}){sub 3} (x=0) phase was carried out by a double aliovalent substitution with respect to the Sr{sup 2+} and Ge{sup 4+} ions that replace Na{sup +}/Ln{sup 3+} and As{sup 5+} in Na{sub 3}LnMn{sub 3}O{sub 3}(AsO{sub 4}){sub 3}, respectively. The title series contains mixed-valent Mn(III)/Mn(IV) and shows a limited range of solid solution, both of which were not observed in the previously reported Na{sub 3}LnMn{sub 3}O{sub 3}(AsO{sub 4}){sub 3} series. To form the Sr{sub 4?x}Ln{sub x}Mn{sub 3}O{sub 3}(GeO{sub 4}){sub 3} solid solution, one of the Sr{sup 2+} sites, i.e., the original Ln-site in Na{sub 3}LnMn{sub 3}O{sub 3}(AsO{sub 4}){sub 3}, is partially substituted by Ln{sup 3+} in a statistical disorder of Sr{sub 1?x}/Ln{sub x}. Initial magnetic investigations of selected derivatives reveal higher ferromagnetic ordering temperatures than those reported for the Na{sub 3}LnMn{sub 3}O{sub 3}(AsO{sub 4}){sub 3} series, presumably attributed to a lesser degree of canting as a result of introducing non-JahnTeller Mn{sup 4+} ions. Also intriguing is the observation of multiple anomalies at low temperatures which appear to be of electronic origins. - Graphical abstract: Sr{sub 4?x}Ln{sub x}Mn(III){sub 2+x}Mn(IV){sub 1?x}O{sub 3}(GeO{sub 4}){sub 3}. Display Omitted - Highlights: Double aliovalent substitution: Sr{sub 4}Mn{sub 3}O{sub 3}(GeO{sub 4}){sub 3} with respect to Na{sub 3}LnMn{sub 3}O{sub 3}(AsO{sub 4}){sub 3}. Solid solution with respect to statistical disorder of Sr{sub 1?x}Ln{sub x} in one of the two Sr sites. Mn{sup 3+}/Mn{sup 4+} magnetic ions are spatially arranged in a triangular kagom fashion. Enhanced ferromagnetic ordering attributed to doping non-JahnTeller Mn{sup 4+}.

West, J. Palmer; Sulejmanovic, Dino [Department of Chemistry, Clemson University, Clemson, SC 29634 (United States); Becht, Gregory [E. I. du Pont, Wilmington, DE 19880-0500 (United States); He, Jian; Hitchcock, Dale [Department of Physics and Astronomy, Clemson University, Clemson, SC 29634 (United States); Yan, Yonggao [Wuhan University of Technology, Wuhan 430070 (China); Hwu, Shiou-Jyh, E-mail: shwu@clemson.edu [Department of Chemistry, Clemson University, Clemson, SC 29634 (United States)

2013-10-15T23:59:59.000Z

158

Magnetoresistance in Mn ion-implanted GaAs:Zn nanowires  

SciTech Connect

We have investigated the magnetoresistance (MR) in a series of Zn doped (p-type) GaAs nanowires implanted with different Mn concentrations. The nanowires with the lowest Mn concentration (?0.0001%) exhibit a low resistance of a few k? at 300?K and a 4% positive MR at 1.6?K, which can be well described by invoking a spin-split subband model. In contrast, nanowires with the highest Mn concentration (4%) display a large resistance of several M? at 300?K and a large negative MR of 85% at 1.6?K. The large negative MR is interpreted in terms of spin-dependent hopping in a complex magnetic nanowire landscape of magnetic polarons, separated by intermediate regions of Mn impurity spins. Sweeping the magnetic field back and forth for the 4% sample reveals a hysteresis that indicates the presence of a weak ferromagnetic phase. We propose co-doping with Zn to be a promising way to reach the goal of realizing ferromagnetic Ga{sub 1?x}Mn{sub x}As nanowires for future nanospintronics.

Paschoal, W.; Kumar, Sandeep; Jain, V.; Pettersson, H., E-mail: hakan.pettersson@hh.se [Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund (Sweden); Department of Mathematics, Physics and Electrical Engineering, Halmstad University, Box 823, SE-301 18, Halmstad (Sweden); Jacobsson, D.; Samuelson, L. [Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund (Sweden); Johannes, A.; Ronning, C. [Institute for Solid State Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, D-07743 Jena (Germany); Canali, C. M.; Pertsova, A. [Department of Physics and Electrical Engineering, Linneaus University, SE-39233 Kalmar (Sweden); Dick, K. A. [Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund (Sweden); Center for Analysis and Synthesis, Lund University, Box 124, S-221 00 Lund (Sweden)

2014-04-14T23:59:59.000Z

159

High-Resolution Structure of the Photosynthetic Mn4Ca Catalyst from X-ray Spectroscopy  

SciTech Connect

The application of high-resolution X-ray spectroscopy methods to study the photosynthetic water oxidizing complex, which contains a unique hetero-nuclear catalytic Mn4Ca cluster, are described. Issues of X-ray damage especially at the metal sites in the Mn4Ca cluster are discussed. The structure of the Mn4Ca catalyst at high-resolution which has so far eluded attempts of determination by X-ray diffraction, EXAFS and other spectroscopic techniques has been addressed using polarized EXAFS techniques applied to oriented PS II membrane preparations and PS II single crystals. A review of how the resolution of traditional EXAFS techniques can be improved, using methods such as range-extended EXAFS is presented, and the changes that occur in the structure of the cluster as it advances through the catalytic cycle are described. X-ray absorption and emission techniques (XANES and K? emission) have been used earlier to determine the oxidation states of the Mn4Ca cluster, and in this report we review the use of X-ray resonant Raman spectroscopy to understand the electronic structure of the Mn4Ca cluster as it cycles through the intermediate S-states.

Yachandra, Vittal; Yano, Junko; Kern, Jan; Pushkar, Yulia; Sauer, Kenneth; Glatzel, Pieter; Bergmann, Uwe; Messinger, Johannes; Zouni, Athina; Yachandra, Vittal K.

2007-08-01T23:59:59.000Z

160

Oxidation State Changes of the Mn(4)Ca Cluster in Photosystem II  

SciTech Connect

A detailed electronic structure of the Mn{sub 4}Ca cluster is required before two key questions for understanding the mechanism of photosynthetic water oxidation can be addressed. They are whether all four oxidizing equivalents necessary to oxidize water to O{sub 2} accumulate on the four Mn ions of the oxygen-evolving complex, or do some ligand-centered oxidations take place before the formation and release of O{sub 2} during the S{sub 3} {yields} [S{sub 4}] {yields} S{sub 0} transition, and what are the oxidation state assignments for the Mn during S-state advancement. X-ray absorption and emission spectroscopy of Mn, including the newly introduced resonant inelastic X-ray scattering spectroscopy have been used to address these questions. The present state of understanding of the electronic structure and oxidation state changes of the Mn{sub 4}Ca cluster in all the S-states, particularly in the S{sub 2} to S{sub 3} transition, derived from these techniques is described in this review.

Yano, J.; Yachandra, V.K.

2009-06-04T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
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161

Novel Solar Energy Conversion Materials by Design of Mn(II) Oxides  

SciTech Connect

Solar energy conversion materials need to fulfill simultaneously a number of requirements in regard of their band-structure, optical properties, carrier transport, and doping. Despite their desirable chemical properties, e.g., for photo-electrocatalysis, transition-metal oxides usually do not have desirable semiconducting properties. Instead, oxides with open cation d-shells are typically Mott or charge-transfer insulators with notoriously poor transport properties, resulting from large effective electron/hole masses or from carrier self-trapping. Based on the notion that the electronic structure features (p-d interaction) supporting the p-type conductivity in d10 oxides like Cu2O and CuAlO2 occurs in a similar fashion also in the d5 (high-spin) oxides, we recently studied theoretically the band-structure and transport properties of the prototypical binary d5 oxides MnO and Fe2O3 [PRB 85, 201202(R)]. We found that MnO tends to self-trap holes by forming Mn+III, whereas Fe2O3 self-traps electrons by forming Fe+II. However, the self-trapping of holes is suppressed by when Mn is tetrahedrally coordinated, which suggests specific routes to design novel solar conversion materials by considering ternary Mn(II) oxides or oxide alloys. We are presenting theory, synthesis, and initial characterization for these novel energy materials.

Lany, S.; Peng, H.; Ndione, P.; Zakutayev, A.; Ginley, D. S.

2013-01-01T23:59:59.000Z

162

Table EA-1. Stream-water dissolved Mn at basin outflow of perennial stream at Inspiration Dam illustrating decreases in dissolved Mn in response to remediation efforts. Dissolved Mn in  

E-Print Network (OSTI)

-Jul-98 2.8E-04 24-Nov-98 3.6E-04 11-Feb-99 1.2E-05 Remedial ground-water pumping begins 24-Mar-99 8.9E) and ground-water (GW) chemistry data for streambed sediment sampling sites. Dissolved concentrations in moleTable EA-1. Stream-water dissolved Mn at basin outflow of perennial stream at Inspiration Dam

163

Synthesis and properties of a new quadruple perovskite: A-site ordered PbMn{sub 3}Mn{sub 4}O{sub 12}  

SciTech Connect

PbMn{sub 3}Mn{sub 4}O{sub 12} a quadruple perovskite was prepared by high pressure and high temperature synthesis. Powder X-ray diffraction (PXD) and differential scanning calorimetry reveal a structural phase transition at {approx}380 K. Rietveld refinement of the synchrotron room temperature data indicate rhombohedral symmetry (R-3) with a=6.43675(4) A and {alpha}=109.556(2) Degree-Sign . Similar 423 K PXD data refined in a body centered cubic cell (Im-3) with a=7.4283(9) A. The temperature variation of magnetization, shows a magnetic field dependent antiferromagnetic-like transition at 68 K, and dynamic fluctuations indicative of magnetic frustration. The semiconducting electrical behavior indicates a large decrease in the conductivity near 68 K. The temperature dependence of the real part of the dielectric constant, {epsilon}{sub real} increases dramatically at {approx}68 K, and shows relaxor-type ferroelectric behavior as a function of frequency. The intimate coupling of magnetic, electrical and dielectric properties at 68 K in PbMn{sub 3}Mn{sub 4}O{sub 12} suggests possible multiferroic behavior. - Graphical abstract: Resistance vs. temperature plot showing drastically increasing resistances at temperatures below 68 K (a). Formation of a frequency dependency of the dielectric constant between 68 K and ambient temperature (b). Sharp cusp in the magnetic susceptibility observed at 68 K which is suppressed with increasing magnetic field (c) indicates coupling of magnetic, electric and dielectric effects. Highlights: Black-Right-Pointing-Pointer PbMn{sub 3}Mn{sub 4}O{sub 12} a quadruple perovskite was prepared at high pressure. Black-Right-Pointing-Pointer A structural transition is seen at 380 K from space group R-3-to-Im-3. Black-Right-Pointing-Pointer An antiferromagnetic transition is observed at 68 K. Black-Right-Pointing-Pointer It is semiconducting with a large decrease in the conductivity near 68 K. Black-Right-Pointing-Pointer The temperature dependence of the dielectric constant increases dramatically at 68 K. Black-Right-Pointing-Pointer Coupling of magnetic, electric and dielectric behavior suggests multiferroicity.

Locherer, T.; Dinnebier, R.; Kremer, R.K. [Max Planck Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart (Germany); Greenblatt, M., E-mail: martha@rutchem.rutgers.edu [Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ 08854 (United States); Jansen, M. [Max Planck Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart (Germany)

2012-06-15T23:59:59.000Z

164

Xcel Energy - Solar*Rewards Program and MN Made PV Rebate Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Xcel Energy - Solar*Rewards Program and MN Made PV Rebate Program Xcel Energy - Solar*Rewards Program and MN Made PV Rebate Program Xcel Energy - Solar*Rewards Program and MN Made PV Rebate Program < Back Eligibility Commercial Local Government Nonprofit Residential Savings Category Solar Buying & Making Electricity Maximum Rebate $90,000 (as determined by the incentive level and maximum system size) Program Info Start Date 03/01/2010 State Minnesota Program Type Utility Rebate Program Rebate Amount REC Rebate Program 2010-2012:$2.25/W DC REC Rebate Program 2013:$1.50/W DC Minnesota Made Bonus 2010-2012:Up to an additional $2.75/W DC (paired with REC Rebate) Provider Xcel Energy '''''Note: All 2012 funding for the Solar*Rewards program and Minnesota Made Bonus has been reserved as of July 11, 2012. On October 1, 2012, the

165

Anomalously large spin susceptibility enhancement in n-doped CdMnTe quantum wells  

SciTech Connect

We report on time-resolved Kerr rotation (TRKR) experiments done on n-doped CdMnTe quantum wells (QWs), in the regime where strong coupling between the electron and the Mn spin-flip excitations shows up. It has been proposed previously to deduce the 2D electron gas spin susceptibility from the coupling energy between these spin excitations. Here we measure the coupling energy on a high mobility sample down to very low excitation density, and compare the results with spin-flip Raman scattering (SFRS) on the same sample. The electron spin polarizations measured by TRKR and SFRS are found in relatively good agreement. However the spin susceptibility measured by TRKR exceeds systematically the values predicted by many-body theory. This could be an indication that the two-oscillator model used to describe mixed electron-Mn spin excitations needs to be improved.

Ben Cheikh, Z. [Laboratoire Charles Coulomb, UMR 5221, Dpartement Semi-conducteurs, Matriaux et Capteurs, Universit Montpellier 2, France and Laboratoire de Physique des Matriaux: Structures et Proprits, Facult (Tunisia); Cronenberger, S.; Vladimirova, M.; Scalbert, D. [Laboratoire Charles Coulomb, UMR 5221, Departement Semi-conducteurs, Materiaux et Capteurs, Universite Montpellier 2 (France); Boujdaria, K. [Laboratoire de Physique des Matriaux: Structures et Proprits, Facult des Sciences de Bizerte, Universit de Carthage, 7021 Zarzouna (Tunisia); Baboux, F.; Perez, F. [Institut des NanoSciences de Paris, CNRS/Universit Paris 6, 4 place Jussieu, F-75005 Paris (France); Wojtowicz, T.; Karczewski, G. [Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw (Poland)

2013-12-04T23:59:59.000Z

166

In-situ spectro-microscopy on organic films: Mn-Phthalocyanine on Ag(100)  

SciTech Connect

Metal phthalocyanines are attracting significant attention, owing to their potential for applications in chemical sensors, solar cells and organic magnets. As the electronic properties of molecular films are determined by their crystallinity and molecular packing, the optimization of film quality is important for improving the performance of organic devices. Here, we present the results of in situ low-energy electron microscopy / photoemission electron microscopy (LEEM/PEEM) studies of incorporation-limited growth [1] of manganese-phthalocyanine (MnPc) on Ag(100) surfaces. MnPc thin films were grown on both, bulk Ag(100) surface and thin Ag(100)/Fe(100) films, where substrate spin-polarized electronic states can be modified through tuning the thickness of the Ag film [2]. We also discuss the electronic structure and magnetic ordering in MnPc thin films, investigated by angle- and spin-resolved photoemission spectroscopy.

Al-Mahboob A.; Vescovo, E.; Sadowski, J.T.

2013-08-18T23:59:59.000Z

167

Electronic structural and magnetic properties of Mn{sub 5}Ge{sub 3} clusters  

SciTech Connect

Theoretical understanding of the stability, ferromagnetism, and spin polarization of Mn{sub 5}Ge{sub 3} clusters has been performed by using the density functional theory with generalized gradient approximation for exchange and correlation. The magnetic moments and magnetic anisotropy energy (MAE) have been calculated for both bulk and clusters, and the enhanced magnetic moment as well as the enlarged MAE have been identified in clusters. The most attractive achievement is that Mn{sub 5}Ge{sub 3} clusters show a fine half-metallic character with large energy scales. The present results may have important implications for potential applications of small Mn{sub 5}Ge{sub 3} clusters as both emerging spintronics and next-generation data-storage technologies.

Yuan, H. K.; Chen, H., E-mail: chenh@swu.edu.cn; Kuang, A. L.; Tian, C. L.; Wang, J. Z. [School of Physical Science and Technology, Southwest University, Chongqing 400715 (China)] [School of Physical Science and Technology, Southwest University, Chongqing 400715 (China)

2013-11-28T23:59:59.000Z

168

Neutron and X-ray diffraction studies on the high temperature phase of Mn{sub 3}(VO{sub 4}){sub 2}, the new isostructural compound NaMn{sub 4}(VO{sub 4}){sub 3} and their mixed crystals Na{sub x}Mn{sub 4.5-x/2}(VO{sub 4}){sub 3} (0{<=}x{<=}1)  

SciTech Connect

This paper presents a detailed structure analysis (combined Rietveld analysis of X-ray and neutron powder diffraction data as well as quantum mechanical calculations) of the high temperature phase of Mn{sub 3}(VO{sub 4}){sub 2} (space group I4 Macron 2d). Special attention is directed to the analysis of the local coordination around Mn{sup 2+} ions or vacancies within a stella quadrangula configuration of anions. Furthermore, the new compound NaMn{sub 4}(VO{sub 4}){sub 3} is described as well as a range of mixed crystals between NaMn{sub 4}(VO{sub 4}){sub 3} and Mn{sub 3}(VO{sub 4}){sub 2} (described by the formula Na{sub x}Mn{sub 4.5-x/2}(VO{sub 4}){sub 3}, 0{<=}x{<=}1) which were synthesized by a solid state route. All compounds were shown to be isostructural to the high temperature phase Mn{sub 3}(VO{sub 4}){sub 2}. - Graphical abstract: The crystal structure of the new compound NaMn{sub 4}(VO{sub 4}){sub 3}. Highlights: Black-Right-Pointing-Pointer We present neutron and X-ray diffraction studies on high temperature-Mn{sub 3}(VO{sub 4}){sub 2}. Black-Right-Pointing-Pointer Structural details of partly filled stellae quadrangulae positions are discussed. Black-Right-Pointing-Pointer Refined structural parameters and theoretical calculations are compared. Black-Right-Pointing-Pointer We investigate the mixed crystal system Mn{sub 3}(VO{sub 4}){sub 2}-NaMn{sub 4}(VO{sub 4}){sub 3}.

Clemens, Oliver [Universitaet des Saarlandes, Institut fuer Anorganische und Analytische Chemie und Radiochemie, Am Markt, Zeile 5, 66125 Saarbruecken (Germany)] [Universitaet des Saarlandes, Institut fuer Anorganische und Analytische Chemie und Radiochemie, Am Markt, Zeile 5, 66125 Saarbruecken (Germany); Haberkorn, Robert [Universitaet des Saarlandes, Anorganische Festkoerperchemie, Am Markt, Zeile 3, 66125 Saarbruecken (Germany)] [Universitaet des Saarlandes, Anorganische Festkoerperchemie, Am Markt, Zeile 3, 66125 Saarbruecken (Germany); Springborg, Michael [Universitaet des Saarlandes, Physikalische und Theoretische Chemie, Campus B2 2, 66123 Saarbruecken (Germany)] [Universitaet des Saarlandes, Physikalische und Theoretische Chemie, Campus B2 2, 66123 Saarbruecken (Germany); Beck, Horst Philipp, E-mail: hp.beck@mx.uni-saarland.de [Universitaet des Saarlandes, Institut fuer Anorganische und Analytische Chemie und Radiochemie, Am Markt, Zeile 5, 66125 Saarbruecken (Germany)

2012-10-15T23:59:59.000Z

169

Shell Model for Atomistic Simulation of Lithium Diffusion in Mixed Mn/Ti Oxides  

SciTech Connect

Mixed Mn/Ti oxides present attractive physicochemical properties such as their ability to accommodate Li for application in Li-ion batteries. In this work, atomic parameters for Mn were developed to extend an existing shell model of the Li-Ti-O system and allow simulations of pure and lithiated Mn and mixed Mn/Ti oxide polymorphs. The shell model yielded good agreement with experimentally-derived structures (i.e. lattice parameters and inter-atomic distances) and represented an improvement over existing potential models. The shell model was employed in molecular dynamics (MD) simulations of Li diffusion in the 11 c direction channels of LixMn1 yTiyO2 with the rutile structure, where 0 ? x ? 0.25 and 0 ? y ? 1. In the infinite dilution limit, the arrangement of Mn and Ti ions in the lattice was found to have a significant effect on the activation energy for Li diffusion in the c channels due to the destabilization of half of the interstitial octahedral sites. Anomalous diffusion was demonstrated for Li concentrations as low as x = 0.125, with a single Li ion positioned in every other c channel. Further increase in Li concentration showed not only the substantial effect of Li-Li repulsive interactions on Li mobility but also their influence on the time dependence of Li diffusion. The results of the MD simulations can inform intrinsic structure-property relationships for the rational design of improved electrode materials for Li-ion batteries.

Kerisit, Sebastien N.; Chaka, Anne M.; Droubay, Timothy C.; Ilton, Eugene S.

2014-10-23T23:59:59.000Z

170

Oxygen Atom Transfer and Oxidative Water Incorporation in Cuboidal Mn3MOn Complexes Based on Synthetic, Isotopic Labeling,  

E-Print Network (OSTI)

is performed by the oxygen-evolving center (OEC) of photo- system II (PSII).2 The OEC consists of a Mn4Ca, United States *S Supporting Information ABSTRACT: The oxygen-evolving complex (OEC) of photo- system IIOxygen Atom Transfer and Oxidative Water Incorporation in Cuboidal Mn3MOn Complexes Based

Goddard III, William A.

171

Modulation of atomic positions in CaCuxMn7-xO12 (x 0.1)  

Science Journals Connector (OSTI)

It is shown that there is a close relationship between the modulation of the atomic positions and the modulation of the magnetic moments of Mn ions in CaCuxMn7-xO12 compounds for x = 0 and x = 0.1 at low temperatures.

Slawinski, W.

2009-08-28T23:59:59.000Z

172

Ultrathin Spinel LiMn2O4 Nanowires as High Power Cathode Materials for Li-Ion Batteries  

E-Print Network (OSTI)

Ultrathin Spinel LiMn2O4 Nanowires as High Power Cathode Materials for Li-Ion Batteries Hyun materials as cathode in lithium ion batteries because of its intrinsic low-cost, environmental friendliness that enhances the contact between active material grains and electrolyte. In particular, LiMn2O4 nanorods

Cui, Yi

173

Zn Sorption Mechanisms onto Sheathed Leptothrix Discophora and the Impact of the Nanoparticulate Biogenic Mn Oxide Coating  

SciTech Connect

Zinc sorption on sheathed Leptothrix discophora bacterium, the isolated extracellular polymeric substances (EPS) sheath, and Mn oxide-coated bacteria was investigated with macroscopic and spectroscopic techniques. Complexation with L. discophora was dominated by the outer membrane phosphoryl groups of the phospholipid bilayer while sorption to isolated EPS was dominated by carboxyl groups. Precipitation of nanoparticulate Mn oxide coatings on the cell surface increased site capacity by over twenty times with significant increase in metal sorption. XAS analysis of Zn sorption in the coated system showed Mn oxide phase contributions of 18 to 43% through mononuclear inner-sphere complexes. The coordination environments in coprecipitation samples were identical to those of sorption samples, indicating that, even in coprecipitation, Zn is not incorporated into the Mn oxide structure. Rather, through enzymatic oxidation by L. discophora, Mn(II) is oxidized and precipitated onto the biofilm providing a large surface for metal sequestration. The nanoparticulate Mn oxide coating exhibited significant microporosity (75%) suggesting contributions from intraparticle diffusion. Transient studies conducted over 7 months revealed a 170% increase in Zn loading. However, the intraparticle diffusivity of 10{sup -19} cm{sup 2} s{sup -1} is two orders of magnitude smaller than that for abiotic Mn oxide which we attribute to morphological changes such as reduced pore sizes in the nanoparticulate oxide. Our results demonstrate that the cell-bound Mn oxide particles can sorb significant amounts of Zn over long periods of time representing an important surface for sequestration of metal contaminants.

Boonfueng, T.; Axe, L; Yee, N; Hahn, D; Ndiba, P

2009-01-01T23:59:59.000Z

174

Impedance behavior of the LiMn2O4/LiPF6-DMC-EC interface during cycling  

SciTech Connect

Room temperature impedance measurements of the LiMn2O4/LiPF6-EC-DMC interface have been used to identify a previously unreported step in the formation of the SEI layer on this cathode. The low frequency impedance and potential of pure dense LiMn2O4 films was found to depend logarithmically on time in the end-of-discharge (EOD) state. The rate of the impedance rise decreased with Mn3+ content. The increased impedance was removed by oxidation of the film to 4.5 V vs. Li/Li+. The observations are consistent with a reversible disproportionation of part of the LiMn2O4 into Li2Mn2O4 and l-Mn2O4. Analyses of cyclic voltammograms and impedance spectra at intervals during constant current cycling of the LiMn2O4 films suggest that Li2Mn2O4 on the surface also plays a major role in the capacity fade.

Striebel, Kathryn A.; Sakai, Eiji; Cairns, Elton J.

2000-12-19T23:59:59.000Z

175

Mn3O4-Graphene Hybrid as a High-Capacity Anode Material for Lithium Ion Hailiang Wang,,  

E-Print Network (OSTI)

Mn3O4-Graphene Hybrid as a High-Capacity Anode Material for Lithium Ion Batteries Hailiang Wang hybrid materials of Mn3O4 nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery-cost, and environ- mentally friendly anode for lithium ion batteries. Our growth-on- graphene approach should offer

Cui, Yi

176

The influence of aluminium content to the stacking fault energy in Fe-Mn-Al-C alloy system  

Science Journals Connector (OSTI)

Four Fe-30Mn-0.9C-XAl alloys are employed to investigate the influence of aluminium content to the stacking fault energy in Fe-Mn-Al-C alloy system. The range of aluminium content is zero to 8.47 wt%. ... on the ...

W. S. Yang; C. M. Wan

1990-03-01T23:59:59.000Z

177

Prospects for high temperature ferromagnetism in (Ga,Mn)As semiconductors  

E-Print Network (OSTI)

by the energy cost of flipping one MnGa moment, which can be calculated for a given chemical composition.50 This effec- tive field Hef f corresponds to HMF in the semi- phenomenological kinetic-exchange model used in the previ- ous section, i.e., k... by the energy cost of flipping one MnGa moment, which can be calculated for a given chemical composition.50 This effec- tive field Hef f corresponds to HMF in the semi- phenomenological kinetic-exchange model used in the previ- ous section, i.e., k...

Jungwirth, T.; Wang, KY; Masek, J.; Edmonds, KW; Konig, J.; Sinova, Jairo; Polini, M.; Goncharuk, NA; MacDonald, AH; Sawicki, M.; Rushforth, AW; Campion, RP; Zhao, LX; Foxon, CT; Gallagher, BL.

2005-01-01T23:59:59.000Z

178

Functionalization of Biomass Carbonaceous Aerogels: Selective Preparation of MnO2@CA Composites for Supercapacitors  

Science Journals Connector (OSTI)

In this work, we present a facile and scalable method to synthesize MnO2 loaded carbonaceous aerogel (MnO2@CA) composites via the hydrothermal carbonaceous (HTC) process. ... Carbon-based materials have received the most attention for their remarkable and unusual physicochemical properties, motivated by their potential importance in separation science, heterogeneous catalyst supports, and water purification filters, and as well as the developing areas of energy generation and storage. ... The obtained samples were filtered, washed several times with deionized water and dehydrated alcohol to remove impurities and excess ions, and then dried in air at 60 C for 24 h. ...

Yumei Ren; Qun Xu; Jianmin Zhang; Hongxia Yang; Bo Wang; Daoyuan Yang; Junhua Hu; Zhimin Liu

2014-06-02T23:59:59.000Z

179

Ferromagnetic transition temperature enhancement in (Ga,Mn)As semiconductors by carbon codoping  

E-Print Network (OSTI)

by a recent experimental observation of a marked enhancement of the Curie temperature in Mn-implanted GaAs:C samples compared to the Mn-implanted undoped GaAs layers.11 We focus on two key issues related to high-density carbon dop- ing. ~i.... Jungwirth,1,2 J. Mas?ek,3 Jairo 1Institute of Physics ASCR, Cukrovarnick 2University of Texas at Austin, Physics Department, 1 U 3Institute of Physics ASCR, Na Slovanc 4Department of Physics, Texas A&M Universit ~Received 23 June 2003; revised...

Jungwirth, T.; Masek, J.; Sinova, Jairo; MacDonald, AH.

2003-01-01T23:59:59.000Z

180

Quantum Critical Transition Amplifies Magnetoelastic Coupling in Mn[N(CN)2]2  

We report the discovery of a magnetic quantum critical transition in Mn[N(CN)2]2 that drives the system from a canted antiferromagnetic state to the fully polarized state with amplified magnetoelastic coupling as an intrinsic part of the process. The local lattice distortions, revealed through systematic phonon frequency shifts, suggest a combined MnN6 octahedra distortion+counterrotation mechanism that reduces antiferromagnetic interactions and acts to accommodate the field-induced state. These findings deepen our understanding of magnetoelastic coupling near a magnetic quantum critical point and away from the static limit.

Brinzari, T. V.; Chen, P.; Sun, Q.-C.; Liu, J.; Tung, L.-C.; Wang, Y.; Schlueter, J. A.; Singleton, J.; Manson, J. L.; Whangbo, M.-H.; Litvinchuk, A. P.; Musfeldt, J. L.

2013-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Modeling and Characterization of the Magnetocaloric Effect in Ni2MnGa Materials  

SciTech Connect

Magnetic shape memory alloys have great promise as magneto-caloric effect refrigerant materials due to their combined magnetic and structural transitions. Computational and experimental research is reported on the Ni2MnGa material system. The magnetic states of this system are explored using the Wang-Landau statistical approach in conjunction with the Locally Self-consistent Multiple-Scattering method. The effects of alloying agents on the transition temperatures of the Ni2MnGa alloy are investigated using differential scanning calorimetry and superconducting quantum interference device. Experiments are performed at the Spallation Neutron Source at Oak Ridge National Laboratory to observe the structural and magnetic phase transformations.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Shassere, Benjamin [ORNL; Rios, Orlando [ORNL; Hodges, Jason P [ORNL; Ludtka, Gerard Michael [ORNL; Porter, Wallace D [ORNL; Safa-Sefat, Athena [ORNL; Rusanu, Aurelian [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2014-01-01T23:59:59.000Z

182

A study of magnetic anisotropy energy in CuMn spin glass  

E-Print Network (OSTI)

A STUDY OF MAGNETIC ANISOTROPY ENERGY IN CuMn SPIN GLASS A Thesis by CHRISTINE ADELE ALLEN Submitted to the Graduate College of Texas ARM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1986... Major Subject: Physics A STUDY OF MAGNETIC ANISOTROPY ENERGY IN CuMn SPIN GLASS A Thesis by CHRISTINE ADELE ALLEN Approved as to style and content by: Thomas W. Adair, III (Chai man of Committee) Robert A. enefick (Member) Donald L. Parker...

Allen, Christine Adele

2012-06-07T23:59:59.000Z

183

Ferromagnetism of GaMnAs studied by polarized neutron reflectometry  

Science Journals Connector (OSTI)

Polarized neutron reflectometry has been used to investigate details of spin ordering in ferromagnetic (FM) GaMnAs/GaAs superlattices. The reflectivity spectra measured below the Curie temperature reveal additional magnetic contributions to the structural superlattice Bragg peaks, clearly indicating the existence of FM interlayer correlations. Closer investigation of the magnetic reflectivity maxima using a full polarization analysis provides direct evidence that the FM order in the GaMnAs layers is truly long range. Moreover, as shown by the data, the system exhibits a strong tendency of forming a single-domain FM arrangement, even when cooled through TC in zero external field.

H. K?pa; J. Kutner-Pielaszek; A. Twardowski; C. F. Majkrzak; J. Sadowski; T. Story; T. M. Giebultowicz

2001-09-05T23:59:59.000Z

184

Small-angle neutron scattering analysis of MnC clusters in high-manganese 18Mn0.6C steel  

Science Journals Connector (OSTI)

Abstract Nanometer-scale particles (MnC clusters) were analyzed quantitatively using small-angle neutron scattering in 18Mn0.6C (wt.%) austenite high-manganese steel. The size, number, and volume fraction of the particles were determined as a function of strain (0, 5, 15, 30, 45, 50%) at different temperatures (25 and 100C). The diameter of the cluster ranges from 2 to 14nm in the matrix. The total volume fraction of the cluster significantly increases from 2.7נ10?6 to 8.7נ10?6 as the strain increases. Such clustering phenomenon is correlated to the serration behavior under loading in high-manganese steels.

Mihyun Kang; Eunjoo Shin; Wanchuck Woo; Young-Kook Lee

2014-01-01T23:59:59.000Z

185

Evolution of the composition and structure of cleaved and heat-treated icosahedral Al-Pd-Mn quasicrystal surfaces  

Science Journals Connector (OSTI)

We investigated the changes in composition and structure induced by heat treatment of cleaved fivefold icosahedral Al-Pd-Mn quasicrystal surfaces by scanning electron microscopy and calibrated Auger electron spectroscopy. With increasing temperature we observed five different composition ranges of the surface coupled with distinct changes in the surface morphology. The changes in composition can be explained by successive evaporation and diffusion processes occurring with increasing temperatures. First, Mn evaporates from the uppermost surface layer, then Al evaporation starts and induces a further Mn evaporation leading to an enrichment in Pd. The enrichment is reduced by Mn diffusion from the bulk, Al diffusion from the bulk, and probably simultaneously occurring Pd desorption. Finally, a recrystallization of the surface is induced by the full diffusive mobility of all elements and preferential evaporation of Mn and to a lesser degree of Al. We also discuss the signature of the bonding configuration of Al in the Auger spectra of all investigated compositions.

Ph. Ebert, F. Kluge, B. Grushko, and K. Urban

1999-07-01T23:59:59.000Z

186

The effect of Mn on the oxidation behavior and electrical conductivity of Fe17Cr alloys in solid oxide fuel cell cathode atmosphere  

Science Journals Connector (OSTI)

Four Fe17Cr alloys with various Mn contents between 0.0 and 3.0wt.% are prepared for investigation of the effect of Mn content on the oxidation behavior and electrical conductivity of the FeCr alloys for the application of metallic interconnects in solid oxide fuel cells (SOFCs). During the initial oxidation stage (within 1min) at 750C in air, Cr is preferentially oxidized to form a layer of Cr2O3 type oxide in all the alloys, regardless the Mn content, with similar oxidation rate and oxide morphology. The subsequent oxidation of the Mn containing alloys is accelerated caused by the fast outward diffusion of Mn ions across the Cr2O3 type oxide layer to form Mn-rich (Mn, Cr)3O4 and Mn2O3 oxides on the top. After 700h oxidation a multi-layered oxide scale is observed in the Mn containing alloys, which corresponds to a multi-stage oxidation kinetics in the alloys containing 0.5 and 1.0wt.% of Mn. The oxidation rate and ASR of the oxide scale increase with the Mn content in the alloy changes from 0.0 to 3.0wt.%. For the application of metallic interconnects in SOFCs, Mn-free Fe17Cr alloy with conducting Cr free spinel coatings is preferred.

Bin Hua; Yonghong Kong; Wenying Zhang; Jian Pu; Bo Chi; Li Jian

2011-01-01T23:59:59.000Z

187

A violet emission in ZnS:Mn,Eu: Luminescence and applications for radiation detection  

SciTech Connect

We prepared manganese and europium co-doped zinc sulfide (ZnS:Mn,Eu) phosphors and used them for radiation detection. In addition to the red fluorescence at 583?nm due to the d-d transition of Mn ions, an intense violet emission at 420?nm is newly observed in ZnS:Mn,Eu phosphors. The emission is related to Eu{sup 2+} doping but only appears at certain Eu{sup 2+} concentrations. It is found that the intensity of the 420?nm violet fluorescence is X-ray does-dependent, while the red fluorescence of 583?nm is not. The ratio of fluorescence intensities at 420?nm and 583?nm has been monitored as a function of X-ray doses that exposed upon the ZnS:Mn,Eu phosphors. Empirical formulas are provided to estimate the doses of applied X-ray irradiation. Finally, possible mechanisms of X-ray irradiation induced fluorescence quenching are discussed. The intense 420?nm emission not only provides a violet light for solid state lighting but also offers a very sensitive method for radiation detection.

Ma, Lun; Chen, Wei, E-mail: weichen@uta.edu [Department of Physics and the SAVANT Center, The University of Texas at Arlington, Arlington, Texas 76019-0059 (United States); Jiang, Ke [Center for Biofrontiers Institute, University of Colorado at Colorado Springs, 1420 Austin Bluffs Pkwy., Colorado Springs, Colorado 80918 (United States); Liu, Xiao-tang [Department of Physics and the SAVANT Center, The University of Texas at Arlington, Arlington, Texas 76019-0059 (United States); Department of Applied Chemistry, College of Science, South China Agricultural University, Guangzhou 510642 (China)

2014-03-14T23:59:59.000Z

188

Synthesis of Single-Crystalline La1-xBaxMnO3 Nanocubes with  

E-Print Network (OSTI)

Synthesis of Single-Crystalline La1-xBaxMnO3 Nanocubes with Adjustable Doping Levels Jeffrey J; Revised Manuscript Received July 1, 2004 ABSTRACT We report a hydrothermal synthesis of single.3, 0.5, and 0.6). The synthesis yields clearly faceted nanocubes with a pseudo-cubic perovskite

Heller, Eric

189

Frustration and multiferroic behavior in Ca3CoMnO6  

SciTech Connect

Lu{sub 2}MnCoO{sub 6} and Ca{sub 3}MnCoO{sub 6} satisfy one of the primary goals of multiferroics research, namely ferromagnetic-like magnetization coupled to ferroelectric-like polarization. Thus the mechanism for magnetoelectric coupling in these materials deserves careful study. New data shows that the physics of these compound may be related to the classic 'ANNNI' model. Frustration between ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions between Ising spins creates an 'up up down down' magnetic structure in zero magnetic field, along c-axis chains that consist of alternating Co and Mn ions. In applied magnetic fields 'up up down,' 'up up up down' and other metastable variations can evolve, yielding hysteretic ferromagnetic-like magnetization. The key is that the phase slips between regions of 'up' and 'down' carries an electric polarization due to broken spatial inversion symmetry. Thus these phase slips can be manipulated with both electric and magnetic fields. The result is a profusion of magnetic and electric states that are closely-spaced in temperature, electric, and magnetic field. We present experimental studies of the magnetic, electric, and structural properties of these two compounds. We include very new data up to 100 Ton Ca{sub 3}CoMnO{sub 6} that resolves a key controversy of over the magnetic structure and the size of the moments.

Zapf, Vivien [Los Alamos National Laboratory

2012-06-01T23:59:59.000Z

190

Alternating Current Driven Electroluminescence from ZnSe/ZnS:Mn/  

E-Print Network (OSTI)

phosphor impurity dopants in ZnSe or other wide band gap host nanocrystals. Lumines- cence of CdS of alternating current thin-film electroluminescent (AC-TFEL) devices using phosphor-doped nanocrystals-TFEL devices consist of a phosphor layer, such as manganese-doped zinc sulfide (ZnS:Mn), vertically sandwiched

191

A low-temperature neutron diffraction study of Mn12-acetate  

Science Journals Connector (OSTI)

The low-temperature structure of the title dodecanuclear mixed-valence manganese carboxylate, [Mn12O12(CD3COO)16(H2O)4]2CD3COOH4H2O, is similar to the room-temperature structure, differing by a small change in the configuration of one of the coordinated acetate groups, related to additional hydrogen bonding.

Langan, P.

2001-08-09T23:59:59.000Z

192

Atomic and molecular adsorption on RhMn alloy surface: A first principles study  

E-Print Network (OSTI)

and hydrogen from reforming of natural gas and coal to hydro- carbon Fishcher-Tropsch synthesis and oxygenates- bon and partial oxidation of methane.15 The importance of Rh catalysts on catalytic reactions molecules in terms of the energetics and site preferences on Rh catalysts as well as the effects of Mn added

Li, Weixue

193

Electrodeposition of Mn-Co Alloys on Stainless Steels for SOFC Interconnect Application  

SciTech Connect

Chromium-containing ferritic stainless steels are the most popular materials for solid oxide fuel cell (SOFC) interconnect applications because of its oxidation resistance and easy fabrication process. However, excessive scale growth and chromium evaporation will degrade the cell performance. Highly conductive coatings that resist oxide scale growth and chromium evaporation may prevent both of these problems. Mn1.5Co1.5O4 spinel is one of the most promising coatings for interconnect application because of its high conducitivy, good chromium retention capability, as well as good CTE match. Electroplating of alloys or thin film multilayers followed by controlled oxidation to the desired spinel phase offers an additional deposition option. In the present study binary Mn/Co alloys was fabricated by electrodeposition, and polarization curves were used to characterize the cathodic reactions on substrate surface. By controlling the current density precisely, coatings with Mn/Co around 1:1 has been successfully deposited in Mn/Co =10 solutions, SEM and EDX was used to characterize the surface morphology and composition.

Wu, J. (West Virginia University); Jiang, Y. (West Virginia University); Johnson, C.; Gong, M. (West Virginia University); Liu, X. (West Virginia University)

2007-09-01T23:59:59.000Z

194

Crystallography of Interfaces and Grain Size Distributions in Sr-Doped LaMnO3  

E-Print Network (OSTI)

Crystallography of Interfaces and Grain Size Distributions in Sr-Doped LaMnO3 Qinyuan Liu,§ Sudip systems are similar. I. Introduction HIGH-TEMPERATURE solid oxide fuel cells (SOFCs) offer highly efficient, clean, direct conversion of chemical to electrical energy.1 SOFC performance is dictated

Rohrer, Gregory S.

195

Diverse Structural and Magnetic Properties of Differently Prepared MnAs Nanoparticles  

Science Journals Connector (OSTI)

? Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, United States ... In studies on bulk MnAs, scientists observed that the structural transition can be driven by the application of a magnetic field,(1) which confirms that the coupling between the magnetic transition and structural transition is strong. ...

Peng Tian; Yanhua Zhang; Keerthi Senevirathne; Stephanie L. Brock; Ambesh Dixit; Gavin Lawes; Simon J. L. Billinge

2011-03-02T23:59:59.000Z

196

Giant magnetothermal conductivity in the NiMnIn ferromagnetic shape memory alloys  

E-Print Network (OSTI)

­10 It is well known that colossal magne- toresistance CMR in the Mn-based perovskites is closely related, this transition can be shifted to lower temperature and even totally suppressed by a magnetic field. The magnetic: 10.1063/1.2753710 Very recently, Kainuma et al. discovered magnetic-field- induced shape recovery

Zexian, Cao

197

Chobert MN et al LIVER PRECURSOR CELLS INCREASE HEPATIC FIBROSIS INDUCED BY CHRONIC  

E-Print Network (OSTI)

by chronic carbon tetrachloride (CCl4) administration for 6 weeks, in combination with chronic; CCl4, carbon tetrachloride; CK19, cytokeratin 19; CCR2, chemokine C-C motif receptor 2; EMTChobert MN et al LIVER PRECURSOR CELLS INCREASE HEPATIC FIBROSIS INDUCED BY CHRONIC CARBON

Boyer, Edmond

198

Anomaly of the electrical resistivity of polyvalent metal films with additions of Mn (and Fe)  

E-Print Network (OSTI)

895 Anomaly of the electrical resistivity of polyvalent metal films with additions of Mn (and Fe) D the films are annealed at a temperature Ta. Then the temperature dependence of the electrical resistance is measured in the temperature range 2 K T T a. The electrical resistance is determined by a conventio- nal

Paris-Sud XI, Université de

199

Opportunistic management for rangelands not at equilibrium MARK WESTOBY, BRIAN WALKER, AND IMANUEL NOY-MEIR  

E-Print Network (OSTI)

between states. Transitions often rquire a combination of clbnatlc clrcumstmces and management action (e-and- transition model, range management would not see itself as estal~ llshlng a permanent quilibrium. Rather. The state-and-transition model is the alternative we consider. We discuss how research and management would

200

p(22) versus c(22) configurations for one Mn monolayer on Fe(001)  

Science Journals Connector (OSTI)

The spin polarization of a Mn monolayer on Fe(001) and the interfacial magnetic coupling have been investigated using the tight-binding linear muffin-tin orbital method. We have studied five spin configurations for the Mn monolayer and found that the two lowest in energy, namely c(22) and p(22)? (the up-arrow ? indicates that the magnetization of the Mn layer points in the same direction than the Fe substrate one), are nearly degenerate. These two configurations lead to different interfacial magnetic couplings and mean surface magnetizations. This result sheds some light onto recent contradictory experimental data.

O. Elmouhssine; G. Mora?-umlauttis; C. Demangeat; J. C. Parlebas

1997-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

A Single Layer of Mn in a GaAs Quantum Well: A Ferromagnet with Quantum Fluctuations  

SciTech Connect

Some of the highest transition temperatures achieved for Mn-doped GaAs have been in &-doped heterostructures with well-separated planes of Mn. But in the absense of magnetic anisotropy, the Mermin-Wagner theorem implies that a single plane of magnetic ions cannot be ferromagnetic. We show that the same mechanism that produces magnetic frustration and suppresses the transition can stabilize ferromagnetic order for a single layer of Mn in a GaAs quantum well. But this comes at the price of quantum fluctuations that suppress the ordered moment from that of a fully saturated ferromagnet.

Melko, Roger G [ORNL; Fishman, Randy Scott [ORNL; Reboredo, Fernando A [ORNL

2007-01-01T23:59:59.000Z

202

Mesoporous MnO2/Carbon Aerogel Composites as Promising Electrode Materials for High-Performance Supercapacitors  

Science Journals Connector (OSTI)

Mesoporous MnO2/Carbon Aerogel Composites as Promising Electrode Materials for High-Performance Supercapacitors ... In this Letter, we explored a novel route to prepare mesoporous MnO2/carbon aerogel composites by electrochemical deposition assisted by gas bubbles. ... The results of nitrogen adsorption?desorption experiments and electrochemical measurements showed that these obtained mesoporous MnO2/carbon aerogel composites had a large specific surface area (120 m2/g), uniform pore-size distribution (around 5 nm), high specific capacitance (515.5 F/g), and good stability over 1000 cycles, which give these composites potential application as high-performance supercapacitor electrode materials. ...

Gao-Ren Li; Zhan-Ping Feng; Yan-Nan Ou; Dingcai Wu; Ruowen Fu; Ye-Xiang Tong

2010-01-12T23:59:59.000Z

203

Sediment-water exchange of Mn, Fe, Ni and Zn in Galveston Bay, Texas  

Science Journals Connector (OSTI)

In-situ benthic flux studies were conducted at three stations in Upper Galveston Bay twice during March 1996 to directly measure release rates of dissolved Mn, Fe, Ni and Zn from the sediments. Results showed reproducible increases with time in both replicate light and lightdark benthic chambers, resulting in average fluxes of ?1200780, ?1712, ?1.60.6 and ?2.40.79 ?mol m?2 day?1 for Mn, Fe, Ni and Zn, respectively. Sediment cores collected during 19941996 showed that surficial pore water concentrations were elevated compared to overlying water column concentrations, suggesting diffusive release from the sediments. Diffusive flux estimates of Mn and Zn agreed in direction with chamber fluxes measured on the same date, but only accounted for 538% of the measured flux. Diffusive fluxes of Fe agreed with measured fluxes at the near Trinity River station but overestimated actual release in the mid and outer Trinity Bay regions, possibly due to inaccurate determination of the Fe pore water gradients or rapid oxidation processes in the overlying water at these stations. In general, measured fluxes of Mn and Ni were higher in the mid Trinity Bay region and suggested a mechanism for the elevated trace metal concentrations previously reported for this region of Galveston Bay. However, the fluxes of Fe were highest in close proximity to the Trinity River, supporting the elevated Fe concentrations measured in this region during this and other studies, and decreased towards middle and outer Trinity Bay. Trace metal turnover times were between 0.1 and 1.2 days for Mn, between 1.3 and 4.6 days for Fe, and between 27 and 100 days for Ni and 1220 days Zn, and were considerably shorter than the average Trinity Bay water residence time (1.5 years) for this period. Comparing area averaged benthic inputs to Trinity River inputs shows the sediments to be a significant source of trace metals to Galveston Bay. However, while benthic inputs of trace metals were measured, water column concentrations remained low despite rapid turnover times for Mn and Fe, suggesting removal of these metals from the water column after release from the sediments.

Kent W Warnken; Gary A Gill; Lawrence L Griffin; Peter H Santschi

2001-01-01T23:59:59.000Z

204

Mn concentration dependent structural and optical properties of a-plane Zn{sub 0.99-x}Mn{sub x}Na{sub 0.01}O  

SciTech Connect

Non-polar a-plane (112{sup }0) Zn{sub 0.99?x}Mn{sub x}Na{sub 0.01}O (x?=?0, 0.02, 0.03, 0.04, and 0.05) thin films have been prepared on r-plane (112{sup }0) sapphire substrates by pulsed laser deposition (PLD). The influences of Mn content on the structural and optical properties of the films have been studied. It is indicated that moderate Mn doping facilitates the non-polar growth of ZnO, and all the doped films are single phase with a hexagonal wurtzite structure. The transmittance spectra suggested that all films are transparent in the visible region exhibiting a transmittance above 80%. Mn{sup 2+} doped Zn{sub 0.99}Na{sub 0.01}O shows an initial decrease of optical band gap (OBG) for small concentration of Mn, followed by a monotonic increase. The anomalous decrease in OBG for low concentrations of Mn is attributed to the strong exchange interaction present between the sp electrons of the host matrix and d electrons of Mn. Emission studies were also performed showing suppressed blue-shifted ultraviolet band and dominant violet-blue bands, which might originate from the zinc vacancy (V{sub Zn}) and zinc interstitial (Zn{sub i}) defects. The intensity of defect-related emission peaks is Mn doping-level-dependent as well and the results coincide well with that from the structural analyses.

Lu, B., E-mail: binlu@zju.edu.cn; Zhou, T. T.; Ma, M. J.; Ye, Y. H.; Ye, Z. Z.; Lu, J. G.; Pan, X. H. [State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)

2013-12-14T23:59:59.000Z

205

Energy Transfer Dynamics and Dopant Luminescence in Mn-Doped CdS/ZnS Core/Shell Nanocrystals.  

E-Print Network (OSTI)

??Mn-doped II-VI semiconductor nanocrystals exhibit bright dopant photoluminescence that has potential usefulness for light emitting devices, temperature sensing, and biological imaging. The bright luminescence comes (more)

Chen, Hsiang-Yun

2012-01-01T23:59:59.000Z

206

Fabrication procedure for LiMn2O4/Graphite-based Lithium-ion Rechargeable Pouch Cells  

E-Print Network (OSTI)

was used for the cathode active material and MCMB 10-28 fromcathode electrode for a spinel cell is composed of 81.6% LiMn 2 O 4 active material,

Liu, Gao; Zheng, Honghe; Battaglia, Vincent S.

2007-01-01T23:59:59.000Z

207

Instability of dilute poly(ethylene-oxide) solutions Y. Layec and M.-N. Layec-Raphalen  

E-Print Network (OSTI)

L-121 Instability of dilute poly(ethylene-oxide) solutions Y. Layec and M.-N. Layec property. Poly- (ethylene-oxide) (PEO) is one such water-soluble polymer largely used in turbulent flows [1

Boyer, Edmond

208

Electronic Structure of a Paramagnetic {MNO}[superscript 6] Complex: MnNO 5,5-Tropocoronand  

E-Print Network (OSTI)

Using density functional theory (OLYP/STO-TZP) calculations, we have investigated the electronic structure of [Mn(5,5-tropocoronand)(NO)], a rare paramagnetic {MNO}6 complex. Experimental methods, including magnetic ...

Tangen, Espen

209

Synthesis and electrochemical characterization of LiMn2O4 cathode materials for lithium polymer batteries  

Science Journals Connector (OSTI)

Spinel LiMn2O4 powders with sub-micron, narrow particle-size distribution, and phase-pure particles were synthesized at low temperatures from aqueous solution of metal acetate containing glyoxylic acid as a chela...

Yang-Kook Sun; Dong-Won Kim

1999-07-01T23:59:59.000Z

210

Magnetic phase transition in the low-dimensional compound BaMn2Si2O7  

Science Journals Connector (OSTI)

The structural and magnetic properties of BaMn2Si2O7 have been investigated. The magnetic susceptibility and specific heat, measured using single crystals, suggest that the quasi-one-dimensional magnetism originating from the loosely coupled Mn2+ chain carrying S=5/2 is present at high temperatures, which is similar to the other quasi-one-dimensional barium silicates, BaM2Si2O7 (M: Cu and Co). The Nel temperature (TN?26 K) is high compared to the magnetic interaction along the chain (J=?6 K). Neutron powder diffraction study has revealed that the magnetic structure is long ranged with antiferromagnetic arrangement along the chain (c) direction and ferromagnetic arrangement along the a and b axes. Detailed structural analysis suggests that the interchain interaction via Mn-O-Mn bond along the a axis is relatively large, which makes the system behave more two-dimensionally in the ac plane and enhances TN.

J. Ma; C. D. Dela Cruz; Tao Hong; W. Tian; A. A. Aczel; Songxue Chi; J.-Q. Yan; Z. L. Dun; H. D. Zhou; M. Matsuda

2013-10-04T23:59:59.000Z

211

Ferromagnetic Mn5Ge3C0.8contacts on Ge: work function and specific contact resistivity  

Science Journals Connector (OSTI)

We report on the study of the electrical and magnetic properties of Mn5Ge3C0.8contacts deposited on highly doped n-Ge (1?0?0) as a potentially complementary metaloxidesemiconductor (CMOS)-compatible material system for spin injection into Ge. Mn5Ge3C0.8is a ferromagnet with a Curie temperature of 445K and with a resistivity that is comparable to highly doped Ge. We extract the work function of Mn5Ge3C0.8from metaloxidesemiconductor capacitance measurements and obtain a specific contact resistivity rC = 5.0 ? cm2from transmission-line measurements. We discuss possible origins of the large specific contact resistivity of Mn5Ge3C0.8on Ge.

I A Fischer; J Gebauer; E Rolseth; P Winkel; L-T Chang; K L Wang; C Srgers; J Schulze

2013-01-01T23:59:59.000Z

212

Internal energy transfer phenomenon and light-emission properties of ?-LiAlO2 phosphor doped with Mn2+  

Science Journals Connector (OSTI)

?-LiAlO2:Mn2+...phosphor was synthesized using the cellulose-citric acid sol-gel method, and its light emission and energy transfer properties were investigated. Excitation and emission...2+...do...

Bai-Bin Wang; Chi-Fen Chang; Wein-Duo Yang

2013-07-01T23:59:59.000Z

213

FTIR and Raman Study of LixTiyMn1-y2(y=0,0.11) Cathodes in  

NLE Websites -- All DOE Office Websites (Extended Search)

FTIR and Raman Study of LixTiyMn1-y2(y=0,0.11) Cathodes in FTIR and Raman Study of LixTiyMn1-y2(y=0,0.11) Cathodes in Pyrrolidinium-based Ionic Liquid Electrolyte Systems Title FTIR and Raman Study of LixTiyMn1-y2(y=0,0.11) Cathodes in Pyrrolidinium-based Ionic Liquid Electrolyte Systems Publication Type Journal Article Year of Publication 2009 Authors Hardwick, Laurence J., Juliette A. Saint, Ivan T. Lucas, Marca M. Doeff, and Robert Kostecki Journal J. Electrochemical Society Volume 156 Issue 2 Pagination A120-A127 Keywords electrochemical electrodes, Fourier transform spectra, infrared spectra, lithium compounds, manganese compounds, Raman spectra, titanium compounds Abstract This work demonstrates the protective effect of partial titanium substitution in LixTi0.11Mn0.89O2 against surface decomposition in room-temperature ionic liquid (RTILs) cells. Raman microscopy and reflectance Fourier transform IR (FTIR) spectroscopy were used to analyze electrodes recovered from cycled Li/LixTiyMn1-yO2 (y=0,0.11) cells containing the 0.5mol/kg LiTFSI in P13FSI RTIL electrolyte. [TFSI=bis(trifluoromethanesulfonyl)imide .] Raman and FTIR spectra of cycled LixMnO2 cathodes showed many distinct bands that can be attributed to both the electrolyte and electrode decomposition products. The thickness of the amorphous porous layer on the LixMnO2 cathode increased during cycling. The surface degradation of LixMnO2 and precipitation of electrolyte decomposition products contributed to the film growth. Improved cycling behavior was observed in cells containing LixTi0.11Mn0.89O2 , yet Raman spectroscopy also showed possible surface degradation. The FTIR spectra of cycled LixMnO2 and LixTi0.11Mn0.89O2 cathodes displayed bands characteristic for LiSO3CF3 and Li2NSO2CF3 , which originate from the reaction of the TFSI anion with traces of water present in the cell.

214

Prediction of O2 Dissociation Kinetics on LaMnO3-Based Cathode Materials for Solid Oxide Fuel Cells  

SciTech Connect

First-principles and statistical-theory calculations were applied to examine the interactions between oxygen molecules and the (100) surfaces of LaMnO3 and La0.5Sr0.5MnO2.75, one of the most-used cathode materials in solid oxide fuel cells (SOFCs). To predict the rate constants for the interactions between O2 and LaMnO3 or La0.5Sr0.5MnO2.75, potential energy profiles were constructed using the nudged elastic band (NEB) method. Predicted rate constants for the dissociation of adsorbed oxygen species on LaMnO3 (lm) and La0.5Sr0.5MnO2.75 (lsm) can be expressed as kdiss,lm ) 2.35 1012 exp(-0.50 eV/RT) s-1 and kdiss,lsm ) 2.15 1012 exp(-0.23 eV/RT) s-1, respectively, in the temperature range of 873-1273 K at 1 atm. Because the activation energy for oxygen dissociation on La0.5Sr0.5MnO2.75 (0.23 eV) is much smaller than that on LaMnO3 (0.50 eV), oxygen vacancies greatly enhance O2 dissociation kinetics. The kinetic and mechanistic studies for the interactions at the molecular level are imperative to gaining a fundamental understanding of oxygen reduction kinetics on cathode materials and to providing important insight into the rational design of more catalytically active cathode materials for SOFCs.

Choi, Yongman; Lynch, Matthew E.; Lin, M. C.; Liu, Meilin

2009-04-30T23:59:59.000Z

215

Coulomb interaction of acceptors in Cd{sub 1?x}Mn{sub x}Te/CdTe quantum dot  

SciTech Connect

The investigation on the effect of confining potential like isotropic harmonic oscillator type potential on the binding and the Coulomb interaction energy of the double acceptors in the presence of magnetic field in a Cd{sub 1?x}Mn{sub x}Te/CdTe Spherical Quantum Dot has been made for the Mn ion composition x=0.3 and compared with the results obtained from the square well type potential using variational procedure in the effective mass approximation.

Kalpana, P.; Nithiananthi, P., E-mail: kjkumar-gri@rediffmail.com; Jayakumar, K., E-mail: kjkumar-gri@rediffmail.com [Department of Physics, Gandhigram Rural University, Gandhigram-624302, TamilNadu (India); Reuben, A. Merwyn Jasper D. [Department of Physics, School of Engineering, Saveetha University, Thandalam, Chennai- 600104, TamilNadu (India)

2014-04-24T23:59:59.000Z

216

Magnetocaloric and magnetoresistive properties of La0.67Ca0.33-xSrxMnO3  

E-Print Network (OSTI)

Risø-PhD-5 Magnetocaloric and magnetoresistive properties of La0.67Ca0.33-xSrxMnO3 Anders Reves: Magnetocaloric and magnetoresistive properties of La0.67Ca0.33-xSrxMnO3 Department: Materials Research Department of magneto- caloric and magnetoresistive properties of a series of polycrystalline Ca- and Sr- doped

217

On the electrical resistivity of Pt3FexMn1-x alloys in the exchange inversion region  

E-Print Network (OSTI)

L-781 On the electrical resistivity of Pt3FexMn1-x alloys in the exchange inversion region J. V The electrical resistivity (p) data as a function of temperature are reported for Pt3FexMn1-x alloys (with x = 0. The samples for electrical resistivity ( ~ 1 x 1 x 8 mm3) were cut and reannealed for 72 hours before being

Boyer, Edmond

218

RECIPIENT:Minnesota Department of Commerce, Office of Energy Security SEP ARRA STATE: MN  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Minnesota Department of Commerce, Office of Energy Security SEP ARRA STATE: MN Minnesota Department of Commerce, Office of Energy Security SEP ARRA STATE: MN PROJECT TITLE: SEP - Residential Ground Source Heat Pump Installation - Schmitz, Mary C. Funding Opportunity Announcement Number DE FOA 0000052 Procurement Instrument Number EE0000164 NEPA Control Number cm Number GFO-0000164-018 0 Based on my review of the information concerning the proposed action, as NEPA Compliance Officer (authorized under DOE Order 451.1A), I have made the following determination: CX, EA, EIS APPENDIX AND NUMBER: Description: 85.1 Actions to conserve energy, demonstrate potential energy conservation, and promote energy-efficiency that do not increase the indoor concentrations of potentially harmful substances. These actions may involve financial and technical

219

File:USDA-CE-Production-GIFmaps-MN.pdf | Open Energy Information  

Open Energy Info (EERE)

MN.pdf MN.pdf Jump to: navigation, search File File history File usage Minnesota Ethanol Plant Locations Size of this preview: 776 × 600 pixels. Full resolution ‎(1,650 × 1,275 pixels, file size: 311 KB, MIME type: application/pdf) Description Minnesota Ethanol Plant Locations Sources United States Department of Agriculture Related Technologies Biomass, Biofuels, Ethanol Creation Date 2010-01-19 Extent State Countries United States UN Region Northern America States Minnesota External links http://www.nass.usda.gov/Charts_and_Maps/Ethanol_Plants/ File history Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment current 16:16, 27 December 2010 Thumbnail for version as of 16:16, 27 December 2010 1,650 × 1,275 (311 KB) MapBot (Talk | contribs) Automated bot upload

220

Charge Melting & Polaron Collapse in LA1.2SR1.8MN207  

NLE Websites -- All DOE Office Websites (Extended Search)

Charge Melting & Polaron Collapse in LA1.2SR1.8MN207 Charge Melting & Polaron Collapse in LA1.2SR1.8MN207 Recent studies carried out on the Synchrotron Radiation Instrumentation Collaborative Access Team's beamline I-ID-C at the Advanced Photon Source provide new insights into charge melting and polaron collapse. X-ray and neutron scattering measurements directly demonstrate the existence of polarons in the paramagnetic phase of optimally doped colossal magnetoresistive oxides. The polarons exhibit short-range correlations that grow with decreasing temperature, but disappear abruptly at the ferromagnetic transition because of the sudden charge delocalization. The "melting" of the charge ordering as we cool through TC occurs with the collapse of the quasistatic polaron scattering, and provides important new

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

DEPARTMENT OF ENERGY EERE PROJECT MN-IAGEMENT CENTER NEPA DETERMINATION  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

MN-IAGEMENT CENTER MN-IAGEMENT CENTER NEPA DETERMINATION Page 1 of4 RECIPIENT:A1aska Energy Authority STATE: AK PROJECT TITLE: Alaska Wind Energy PrOject Funding Opportunity Announcement Number PnK:urcmcntlnstrumcnl Numbcr NEPA Control Number CID Number DE-FG-36-05GOO85038 DE-FG-36-05GOO85038 GFO-G085038-002 G085038 Bastd on my review orthe information concuning the proposed adion, as NEPA Compliance Officer (authorized under DOE Order 45 1.IA), I have made the following determination: ex, EA. [IS APPENDIX AND NUMBER: Description: 61 .19 Microwave, Siting, construction, modification. operation, and removal of microwave, radio communication, and meteorological , meteorological towers and assOCIated facilities, prOVided that the towers and associated facilitJes would

222

Characterization of Al-Mn particles in AZ91D investment castings  

SciTech Connect

Manganese is currently added to Mg-Al alloys in order to improve the corrosion behavior of cast components. A part of this manganese is dissolved in the magnesium matrix and the balance is found as fine Al(Mn,Fe) particles dispersed within castings. For AZ91D specimens prepared using the plaster mould investment casting process, these particles were observed in very large quantity at the surface of castings. These particles were characterized by scanning electron microscopy and electron probe microanalysis. It was found that they consist of Al{sub 8}Mn{sub 5} phase and that their morphology and size depend on local solidification conditions. Their presence at the surface of the castings is related to low solidification rates and reduced thermal gradients at the mould/metal interface.

Lun Sin, S. [Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, Quebec, G1K 7P4 (Canada); Dube, D. [Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, Quebec, G1K 7P4 (Canada)], E-mail: dominique.dube@gmn.ulaval.ca; Tremblay, R. [Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec, Quebec, G1K 7P4 (Canada)

2007-10-15T23:59:59.000Z

223

Optical transitions in MnGa{sub 2}Se{sub 4}  

SciTech Connect

The dependence of the absorption coefficient on incident photon energy in a MnGa{sub 2}Se{sub 4} single crystal has been investigated in the temperature range 110-295 K. Using group-theory analysis of the electron state symmetry and comparison of the symmetry of the energy spectrum of MnGa{sub 2}Se{sub 4} and its isoelectronic analogs, a conclusion about the character of optical transitions has been drawn. It is shown that the features observed at 2.31 and 2.45 eV are related to the intracenter transitions {sup 6}A{sub 1}{sup 1} {yields} {sup 4}T{sub 2}({sup 4}G) and {sup 6}A{sub 1}{sup 2} {yields} {sup 4}T{sub 2}({sup 4}G). The {sup 6}A{sub 1} state is split by the crystal field.

Tagiev, B. G.; Kerimova, T. G., E-mail: ktaira@physics.ab.az; Tagiev, O. B.; Asadullayeva, S. G.; Mamedova, I. A. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2012-06-15T23:59:59.000Z

224

Quantum confinement induced magnetism in LaNiO3-LaMnO3 superlattices  

SciTech Connect

The emergence of magnetic reconstructions at the interfaces of oxide heterostructures are often explained via subtle modifications in the electronic densities, exchange couplings, or strain. Here, an additional possible route for induced magnetism is studied in the context of the (LaNiO3)n/(LaMnO3)n superlattices using a hybrid tightbinding model. In the LaNiO3 region, the induced magnetizations decouple from the intensity of charge leakage from Mn to Ni, but originate from the spin-filtered quantum confinement present in these nanostructures. In general, the induced magnetization is the largest for the (111)-stacking and the weakest for the (001)-stacking superlattices; results compatible with the exchange bias effects reported byGibert et al. [Nat.Mater. 11, 195 (2012)].

Dong, Shuai [ORNL; Dagotto, Elbio R [ORNL

2013-01-01T23:59:59.000Z

225

Low temperature magnetic properties of magnesium substituted YbMnO{sub 3}  

SciTech Connect

Structural and magnetic properties of polycrystalline Yb{sub 1?x}Mg{sub x}MnO{sub 3} (x = 0, 0.05 and 0.10) hexagonal compounds prepared by solid state method, have been studied. The structural analyses of the samples were carried out by Rietveld analysis of neutron diffraction data. With increasing Mg content, we find that the lattice parameter a decreases and c increases whereas the overall Mn-O bond length decreases. Magnetization measured as a function of magnetic field at 2.5 K exhibits hysteresis, which is attributed to ferromagnetic like ordering of Yb{sup 3+} sublattice. Temperature dependence of ac magnetic susceptibility, ?{sub ac}(T), shows no signature of spin-glass behavior. ?(T) exhibits a sudden increase at low temperatures which is due to ordering of Yb{sup 3+} sublattice.

Sattibabu, Bhumireddi, E-mail: bsb.satti@gmail.com; Bhatnagar, Anil K., E-mail: bsb.satti@gmail.com; Mohan, Dasari, E-mail: bsb.satti@gmail.com; Das, Dibakar, E-mail: bsb.satti@gmail.com; Sundararaman, Mahadevan, E-mail: bsb.satti@gmail.com [School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad-500046 (India); Siruguri, Vasudeva; Rayaprol, Sudhindra [UGC-DAE Consortium for Scientific Research, Mumbai Centre, R-5 Shed, Bhabha Atomic Research Centre, Mumbai-400085 (India)

2014-04-24T23:59:59.000Z

226

Realization of Spin Gapless Semiconductors: The Heusler Compound Mn2CoAl  

Science Journals Connector (OSTI)

Recent studies have reported an interesting class of semiconductor materials that bridge the gap between semiconductors and half-metallic ferromagnets. These materials, called spin gapless semiconductors, exhibit a band gap in one of the spin channels and a zero band gap in the other and thus allow for tunable spin transport. Here, we report the first experimental verification of the spin gapless magnetic semiconductor Mn2CoAl, an inverse Heusler compound with a Curie temperature of 720K and a magnetic moment of 2?B. Below 300K, the compound exhibits nearly temperature-independent conductivity, very low, temperature-independent carrier concentration, and a vanishing Seebeck coefficient. The anomalous Hall effect is comparatively low, which is explained by the symmetry properties of the Berry curvature. Mn2CoAl is not only suitable material for room temperature semiconductor spintronics, the robust spin polarization of the spin gapless semiconductors makes it very promising material for spintronics in general.

Siham Ouardi; Gerhard H. Fecher; Claudia Felser; Jrgen Kbler

2013-03-05T23:59:59.000Z

227

Abundance analysis of SB2 binary stars with HgMn primaries  

E-Print Network (OSTI)

We present a short review of the abundances in the atmospheres of SB2 systems with Mercury-Manganese (HgMn) primaries. Up to now a careful study has been made for both components of 8 out of 17 known SB2 binaries with orbital periods shorter than 100 days and mass ratio ranging from 1.08 to 2.2. For all eight systems we observe a lower Mn abundance in the secondary's atmospheres than in the primary's. Significant difference in the abundances is also found for some peculiar elements such as Ga, Xe, Pt. All secondary stars with effective temperatures less than 10000 K show abundance characteristics typical of the metallic-line stars.

T. Ryabchikova

1998-05-06T23:59:59.000Z

228

Magneto-optical spectroscopy of ferromagnetic shape-memory Ni-Mn-Ga alloy  

SciTech Connect

Magneto-optical properties of single crystal of Ni{sub 50.1}Mn{sub 28.4}Ga{sub 21.5} magnetic shape memory alloy in martensite and austenite phase were systematically studied. Crystal orientation was approximately along (100) planes of parent cubic austenite. At room temperature, the sample was in modulated 10M martensite phase and transformed to cubic austenite at 323?K. Spectral dependence of polar magneto-optical Kerr effect was obtained by generalized magneto-optical ellipsometry with rotating analyzer in the photon energy range from 1.2 to 4?eV, and from room temperature to temperature above the Curie point. The Kerr rotation spectra exhibit prominent features typical for complexes containing Mn atoms. Significant spectral changes during transformation to austenite can be explained by different optical properties caused by changes in density of states near the Fermi energy.

Veis, M., E-mail: veis@karlov.mff.cuni.cz; Beran, L.; Zahradnik, M.; Antos, R. [Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 12116 Prague (Czech Republic); Straka, L. [Aalto University School of Engineering, PL14200, FIN-00076 Aalto (Finland); Kopecek, J.; Fekete, L.; Heczko, O. [Institute of Physics, ASCR, Na Slovance 2, 182 21 Prague (Czech Republic)

2014-05-07T23:59:59.000Z

229

Charge transport mechanisms in Schottky diodes based on low-resistance CdTe:Mn  

SciTech Connect

CdTe:Mn crystals with a resistivity of {approx}1 {Omega} cm at 300 K and Schottky diodes based on them are investigated. The electrical conductivity of the material and its temperature variations are explained in terms of the statistics of electrons and holes in semiconductors with allowance for the compensation processes. The ionization energy and the degree of compensation of the donors responsible for the conductivity are determined. It is shown that, in the case of forward connection and low reverse biases, the currents in Au/CdTe:Mn Schottky diode are determined by generation-recombination processes in the space-charge region. At higher reverse biases (above 1.5-2 V) the excess current is caused by electron tunneling from the metal to the semiconductor, and at even higher voltages (>6-7 V) an additional increase in the reverse current due to avalanche processes is observed.

Kosyachenko, L. A., E-mail: lakos@chv.ukrpack.net; Yurtsenyuk, N. S.; Rarenko, I. M.; Sklyarchuk, V. M.; Sklyarchuk, O. F.; Zakharuk, Z. I.; Grushko, E. V. [Chernivtsi National University (Ukraine)

2013-07-15T23:59:59.000Z

230

Fischer Tropsch synthesis : influence of Mn on the carburization rates and activities of Fe-based catalysts by TPR-EXAFS/XANES and catalyst testing.  

SciTech Connect

Fe-based catalysts containing different amounts of Mn were tested for Fischer-Tropsch synthesis using a stirred tank reactor at 270 C, 1.21 MPa, and H{sub 2}:CO = 0.7. Catalyst activation by carburization with 10% CO/He was followed by Temperature Programmed Reduction/X-ray Absorption Spectroscopy (TPR-EXAFS/XANES) from room temperature to 300 C. {gamma}-Fe{sub 2}O{sub 3} was converted into iron carbides, whereas MnO{sub x} was reduced to oxygen deficient MnO. Mn hindered Fe carburization, such that the carburized catalyst displayed higher Fe{sub 3}O{sub 4} content than the catalyst without Mn. EXAFS fitting indicates that the carburized catalyst contained a mixture of Hgg carbide, Fe{sub 3}O{sub 4}, and Mn oxides. Increasing Mn content led to higher CH{sub 4} and light product selectivities, and lower light olefin selectivities. Higher and stable conversions were obtained with a catalyst containing an almost equimolar Fe/Mn ratio relative to the catalyst without Mn. Selectivity trends are attributed to the higher WGS rates observed on the FeMn catalysts, consistent with the structural differences observed.

Ribeiro, M. C.; Jacobs, G.; Pendyala, R.; Davis, B. H.; Cronauer, D. C.; Kropf, A. J.; Marshall, C. L. (Chemical Sciences and Engineering Division); (Univ. of Kentucky)

2011-03-24T23:59:59.000Z

231

Structural and magnetic properties of Ge{sub 1-x}Mn{sub x} thin films grown on Ge (001) substrates  

SciTech Connect

We investigate the structural and magneto-optical properties of Mn-doped Ge (Ge{sub 1-x}Mn{sub x}) films with self-organized nanocolumns, grown on Ge (001) substrates by molecular beam epitaxy (MBE), in which the substrate temperature (T{sub S}) and growth rate (R{sub G}) are varied. Transmission electron microscopy (TEM) observations and magnetic circular dichroism (MCD) measurements reveal that Mn-rich nanocolumnar precipitation is formed in the Ge{sub 1-x}Mn{sub x} films grown at T{sub S} {<=} 100 deg. C, with keeping the size and spacing. At higher T{sub S} ({>=}150 deg. C), ferromagnetic Mn{sub 5}Ge{sub 3} clusters are formed. It is also found that the Mn distribution in the Ge{sub 1-x}Mn{sub x} films can be controlled: By lowering T{sub S} or increasing R{sub G}, the Mn content x{sub nc} in the nanocolumns decreases and Mn atoms are more distributed into the Ge matrix, and eventually the magnetic properties are changed. The formation of the nanocolumns is explained by the spinodal decomposition in the layer-by-layer growth mode. We analyzed the periodicity and Mn content x{sub nc} of nanocolumns by using the Cahn-Hilliard equation.

Yada, Shinsuke; Nam Hai, Pham; Tanaka, Masaaki [Department of Electrical Engineering and Information Systems, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan); Sugahara, Satoshi [Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 4259-G2-14 Nagatsuta, Yokohama, Kanagawa 226-8502 (Japan)

2011-10-01T23:59:59.000Z

232

ENERGY LEVELS AND SPECTRAL LINES OF SINGLY IONIZED MANGANESE (Mn II)  

SciTech Connect

This compilation revises the previously recommended list of energy levels of singly ionized manganese (Mn II) and provides a comprehensive list of observed spectral lines and transition probabilities in this spectrum. The new level optimization takes into account critically assessed uncertainties of measured wavelengths and includes about a hundred high-precision wavelengths determined by laser spectroscopy and Fourier transform techniques. Uncertainties of 63% of energy levels and 74% of Ritz wavelengths are reduced by a factor of three on average.

Kramida, Alexander; Sansonetti, Jean E. [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)] [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States)

2013-04-01T23:59:59.000Z

233

Microscopic mechanism of the noncrystalline anisotropic magnetoresistance in (Ga,Mn)As  

E-Print Network (OSTI)

system. Several factors obstruct a clearer insight into the phenom- enon: there are many electronic bands crossing the Fermi level in most materials and the AMR of a crystalline material has various contributions of different symmetries. Ab initio... results for ferromagnetic transition metals could not be established.3 Diluted magnetic semiconductors, and #1;Ga,Mn#2;As in par- ticular, offer a promising system in which these issues be- come simplified:7 Fermi level lies close to the top...

Vyborny, Karel; Kucera, Jan; Sinova, Jairo; Rushforth, A. W.; Gallagher, B. L.; Jungwirth, T.

2009-01-01T23:59:59.000Z

234

Construction of the Magnetic Phase Diagram of FeMn/Ni/Cu(001) Using Photoemission Electron Microscopy  

SciTech Connect

Single crystalline FeMn/Ni bilayer was epitaxially grown on Cu(001) substrate and investigated by photoemission electron microscopy (PEEM). The FeMn and Ni films were grown into two cross wedges to facilitate an independent control of the FeMn (0-20 ML) and Ni (0-20 ML) film thicknesses. The Ni magnetic phases were determined by Ni domain images as a function of the Ni thickness (d{sub Ni}) and the FeMn thickness (d{sub FeMn}). The result shows that as the Ni thickness increases, the Ni film undergoes a paramagnetic-to-ferromagnetic state transition at a critical thickness of d{sub FM} and an in-plane to out-of-plane spin reorientation transition at a thicker thickness d{sub SRT}. The phase diagram shows that both d{sub FM} and d{sub SRT} increase as the FeMn film establishes its antiferromagnetic order.

Wu, J.; Scholl, A.; Arenholz, E.; Hwang, C.; Qiu, Z. Q.

2011-01-04T23:59:59.000Z

235

Strain-induced modification in the magnetic properties of Mn{sub 5}Ge{sub 3} thin films  

SciTech Connect

Epitaxial ferromagnetic Mn{sub 5}Ge{sub 3} thin films were stabilized on GaSb(001) and GaAs(001) substrates using molecular beam epitaxy. Compared to bulk Mn{sub 5}Ge{sub 3} materials, an enhancement of the Curie temperature above 350 K and about 320 K was observed for Mn{sub 5}Ge{sub 3}/GaAs(001) and Mn{sub 5}Ge{sub 3}/GaSb(001) heterostructures, respectively. The magnetization was found to decrease from 323 to 245 emu/cm{sup 3} for films grown on GaSb(001) and GaAs(001). Anomalous Hall effect measurements provide evidence of the strain-induced large spin polarization from density-functional study. Furthermore, our calculated results in bulk Mn{sub 5}Ge{sub 3} under strain indicate that the strain is the origin of different physical properties of Mn{sub 5}Ge{sub 3} grown on different substrates.

Dung, Dang Duc [Department of Physics and EHSRC, University of Ulsan, Ulsan 680-749 (Korea, Republic of) [Department of Physics and EHSRC, University of Ulsan, Ulsan 680-749 (Korea, Republic of); Department of General Physics, School of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi (Viet Nam); Odkhuu, Dorj; Cheol Hong, Soon; Cho, Sunglae [Department of Physics and EHSRC, University of Ulsan, Ulsan 680-749 (Korea, Republic of)] [Department of Physics and EHSRC, University of Ulsan, Ulsan 680-749 (Korea, Republic of); Thanh Vinh, Le [Aix Marseille Universit, CNRS, CINaM-UMR 7325, 13288 Marseille (France)] [Aix Marseille Universit, CNRS, CINaM-UMR 7325, 13288 Marseille (France)

2013-08-21T23:59:59.000Z

236

Synthesis of LaMnO{sub 3+{delta}} by firing gels with poly(acrylic acid) in a pure argon stream  

SciTech Connect

Perovskite-type LaMnO{sub 3+{delta}} was synthesized by firing the gels with 0.007-0.033 M of poly(acrylic acid) (PAA) in a pure argon stream. The oxygen content, crystallite size (D{sub 024}), specific surface area, and catalytic activity for CO oxidation in LaMnO{sub 3+{delta}} were measured to characterize the LaMnO{sub 3+{delta}} surface. In spite of a small specific surface area, the catalytic activity for CO oxidation on LaMnO{sub 3+{delta}} fired in the pure argon stream is twice that of LaMnO{sub 3+{delta}} fired in air. These results indicate that firing the gels in the pure argon stream improved the crystallinity (regularity of the ions) of the LaMnO{sub 3+{delta}} surface.

Taguchi, Hideki; Sugita, Akio; Nagao, Mahiko [Okayama Univ. (Japan)] [Okayama Univ. (Japan)

1996-02-01T23:59:59.000Z

237

Combustion Synthesis of Nanoparticulate LiMgxMn1-xPO4 (x=0, 0.1, 0.2) Carbon Composites  

E-Print Network (OSTI)

for Rechargeable Lithium Batteries. J. Electrochem. Soc.Materials for Lithium Batteries. J. Electrochem. Soc. 148,LiMnPO 4 for Lithium Ion Batteries. Electrochem. and Solid

Doeff, Marca M

2010-01-01T23:59:59.000Z

238

Probing The Electrode/Electrolyte Interface in The Lithium Excess Layered Oxide Li1.2Ni0.2Mn0.6O2  

SciTech Connect

A detailed surface investigation of the lithium-excess nickel manganese layered oxide Li1.2Ni0.2Mn0.6O2 structure was carried out using x-ray photoelectron spectroscopy (XPS), total electron yield and transmission x-ray absorption spectroscopy (XAS), and electron energy loss spectroscopy (EELS) during the first two electrochemical cycles. All spectroscopy techniques consistently showed the presence of Mn4+ in the pristine material and a surprising reduction of Mn at the voltage plateau during the first charge. The Mn reduction is accompanied by the oxygen loss revealed by EELS. Upon the first discharge, the Mn at the surface never fully returns back to Mn4+. The electrode/electrolyte interface of this compound consists of the reduced Mn at the crystalline defect-spinel inner layer and an oxidized Mn species simultaneously with the presence of a superoxide species in amorphous outer layer. This proposed model signifies that oxygen vacancy formation and lithium removal result in electrolyte decomposition and superoxide formation, leading to Mn activation/dissolution and surface layer-spinel phase transformation. The results also indicate that the role of oxygen is complex and significant in contributing to the extra capacity of this class of high energy density cathode materials.

Carroll, Kyler J [University of California, San Diego; Qian, Danna [University of California, San Diego; Fell, Chris [University of Florida, Gainesville; Calvin, Scott [Sarah Lawrence College; Veith, Gabriel M [ORNL; Chi, Miaofang [ORNL; Dudney, Nancy J [ORNL; Meng, Ying Shirley [University of California, San Diego

2013-01-01T23:59:59.000Z

239

Investigation of thermal, mechanical and magnetic behaviors of the Cu-11%Al alloy with Ag and Mn additions  

SciTech Connect

The investigation of thermal, mechanical and magnetic behaviors of the Cu-11%Al, Cu-11%Al-3%Ag, Cu-11%Al-10%Mn and Cu-11%Al-10%Mn-3%Ag alloys was made using microhardness measurements, differential scanning calorimetry, X-ray diffractometry, scanning electron microscopy, energy dispersion X-ray spectroscopy and magnetic moment change with applied field measurement. The results indicated that the Mn addition changes the phase stability range, the microhardness values and makes undetectable the eutectoid reaction in annealed Cu-11%Al and Cu-11%Al-3%Ag alloys while the presence of Ag does not modify the phase transformation sequence neither microhardness values of the annealed Cu-11%Al and Cu-11%Al-10%Mn alloys, but it increases the magnetic moment of this latter at about 2.7 times and decreases the rates of eutectoid and peritectoid reactions of the former. - Highlights: Black-Right-Pointing-Pointer The microstructure of Cu-Al alloy is modified in the Ag presence. Black-Right-Pointing-Pointer ({alpha} + {gamma}) phase is stabilized down to room temperature when Ag is added to Cu-Al alloy. Black-Right-Pointing-Pointer Ag-rich phase modifies the magnetic characteristics of Cu-Al-Mn alloy.

Silva, R.A.G., E-mail: galdino.ricardo@gmail.com [Departamento de Ciencias Exatas e da Terra-UNIFESP, Diadema-SP (Brazil)] [Departamento de Ciencias Exatas e da Terra-UNIFESP, Diadema-SP (Brazil); Paganotti, A.; Gama, S. [Departamento de Ciencias Exatas e da Terra-UNIFESP, Diadema-SP (Brazil)] [Departamento de Ciencias Exatas e da Terra-UNIFESP, Diadema-SP (Brazil); Adorno, A.T.; Carvalho, T.M.; Santos, C.M.A. [Instituto de Quimica - UNESP, Araraquara-SP (Brazil)] [Instituto de Quimica - UNESP, Araraquara-SP (Brazil)

2013-01-15T23:59:59.000Z

240

Spinel LiMn(2)O(4)/Reduced Graphene Oxide Hybrid for High Rate Lithium Ion Batteries  

SciTech Connect

A well-crystallized and nano-sized spinel LiMn{sub 2}O{sub 4}/reduced graphene oxide hybrid cathode material for high rate lithium-ion batteries has been successfully synthesized via a microwave-assisted hydrothermal method at 200 C for 30 min without any post heat-treatment. The nano-sized LiMn{sub 2}O{sub 4} particles were evenly dispersed on the reduced graphene oxide template without agglomeration, which allows the inherent high active surface area of individual LiMn{sub 2}O{sub 4} nanoparticles in the hybrid. These unique structural and morphological properties of LiMn{sub 2}O{sub 4} on the highly conductive reduced graphene oxide sheets in the hybrid enable achieving the high specific capacity, an excellent high rate capability and stable cycling performance. An analysis of the cyclic voltammogram data revealed that a large surface charge storage contribution of the LiMn{sub 2}O{sub 4}/reduced graphene oxide hybrid plays an important role in achieving faster charge/discharge.

Bak, S.M.; Nam, K.; Lee, C.-W.; Kim, K.-H.; Jung, H.-C.; Yang, X-Q.; Kim, K.-B.

2011-10-04T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Magnetic and electrical properties of layered magnets Tl(Cr,Mn,Co)Se{sub 2}  

SciTech Connect

Tl(Cr,Mn,Co)Se{sub 2} crystals were synthesized at T {approx} 1050 K. X-ray diffraction analysis showed that TlCrSe{sub 2}, TlMnSe{sub 2}, and TlCoSe{sub 2} compounds crystallize in the hexagonal crystal system with the lattice parameters: a = 3.6999 A, c = 22.6901 A, c/a {approx} 6.133, z = 3, {rho}{sub x} = 6.209 g/cm{sup 3}; a = 6.53 A, c = 23.96 A, c/a {approx} 3.669, z = 8, {rho}{sub x} = 6.71 g/cm{sup 3}; and a = 3.747 A, c = 22.772 A, c/a {approx} 6.077, z = 3, {rho}{sub x} = 7.577 g/cm{sup 3}, respectively. Magnetic and electrical studies in the temperature range from 80-400 K showed that TlCrSe{sub 2} is a semiconductor ferromagnet, TlMnSe{sub 2} is a semiconductor antiferromagnet, and TlCoSe{sub 2} is a ferrimagnet with a conductivity characteristic of metals. A rather large deviation in the experimental effective magnetic moment for TlCrSe{sub 2} (3.05 {mu}B) from the theoretical value (3.85 {mu}B) is attributed to two-dimensional magnetic ordering in the paramagnetic region of the noticeably layered ferromagnet TlCrSe{sub 2}. In TlCrSe{sub 2}, a correlation between magnetic and electrical properties was detected.

Veliyev, R. G.; Sadikhov, R. Z.; Kerimova, E. M., E-mail: ekerimova@physics.ab.az; Asadov, Yu. G.; Jabbarov, A. I. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-02-15T23:59:59.000Z

242

Phase transformation during mechano-synthesis of nanocrystalline/amorphous Fe32Mn6Si alloys  

SciTech Connect

Mechano-synthesis of Fe32Mn6Si alloy by mechanical alloying of the elemental powder mixtures was evaluated by running the ball milling process under an inert argon gas atmosphere. In order to characterize the as-milled powders, powder sampling was performed at predetermined intervals from 0.5 to 192 h. X-ray florescence analyzer, X-ray diffraction, scanning electron microscope, and high resolution transmission electron microscope were utilized to investigate the chemical composition, structural evolution, morphological changes, and microstructure of the as-milled powders, respectively. According to the results, the nanocrystalline FeMnSi alloys were completely synthesized after 48 h of milling. Moreover, the formation of a considerable amount of amorphous phase during the milling process was indicated by quantitative X-ray diffraction analysis as well as high resolution transmission electron microscopy image and its selected area diffraction pattern. It was found that the ?-to-? and subsequently the amorphous-to-crystalline (especially martensite) phase transformation occurred by milling development. - Graphical abstract: Mechano-synthesis of nanocrystalline/amorphous Fe32Mn6Si shape memory alloys in the powder form: amorphous phase formation, ?-to-? phase transformation, mechano-crystallization of the amorphous, and martensite phase formation during the process. Highlights: During MA, the ?-to-? phase transformation and amorphization occurred. Mechano-crystallization of the amorphous phase occurred at sufficient milling time. The formation of high amount of ?-martensite was evidenced at high milling times. The platelet, spherical, and then irregular particle shapes was extended by MA. By MA, the particles size was increased, then reduced, and afterward re-increased.

Amini, Rasool, E-mail: ramini2002@gmail.com [Department of Materials Science and Engineering, Shiraz University of Technology, 71555-313 Shiraz (Iran, Islamic Republic of); Shamsipoor, Ali [Department of Materials Science and Engineering, Shiraz University of Technology, 71555-313 Shiraz (Iran, Islamic Republic of); Ghaffari, Mohammad [Department of Electrical and Electronics Engineering, UNAM-National Institute of Materials Science and Nanotechnology Bilkent University, Ankara 06800 (Turkey); Alizadeh, Morteza [Department of Materials Science and Engineering, Shiraz University of Technology, 71555-313 Shiraz (Iran, Islamic Republic of); Okyay, Ali Kemal [Department of Electrical and Electronics Engineering, UNAM-National Institute of Materials Science and Nanotechnology Bilkent University, Ankara 06800 (Turkey)

2013-10-15T23:59:59.000Z

243

Enhancement of spin-asymmetry by L2{sub 1}-ordering in Co{sub 2}MnSi/Cr/Co{sub 2}MnSi current-perpendicular-to-plane magnetoresistance devices  

SciTech Connect

Co{sub 2}MnSi/Cr/Co{sub 2}MnSi (001)-fully epitaxial current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices were fabricated via an UHV magnetron sputtering system. The relationship between the degree of chemical ordering in Co{sub 2}MnSi (CMS) and the CPP-GMR characteristics was investigated systematically against the annealing temperature of the devices. X-ray diffraction profiles and reflection high-energy electron diffraction images indicated that annealing improved L2{sub 1}-ordering. The MR ratio also increased upon annealing and the maximum MR ratio of 5.2% and {delta}RA of 6.5 m{omega} {mu}m{sup 2} were achieved by annealing at 400 deg. C. These results indicate that promoting the degree of L2{sub 1}-ordering in CMS enhances the bulk and/or interface spin-asymmetry coefficients.

Sakuraba, Y.; Iwase, T.; Saito, K.; Mitani, S.; Takanashi, K. [Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)

2009-01-05T23:59:59.000Z

244

Symmetric interfacial reconstruction and magnetism in La0.7Ca0.3MnO3/YBa2Cu3O7/La0.7Ca0.3MnO3 heterostructures  

SciTech Connect

We have analyzed the interface structure and composition of La{sub 0.7}Ca{sub 0.3}MnO{sub 3}/YBa{sub 2}Cu{sub 3}O{sub 7}/La{sub 0.7}Ca{sub 0.3}MnO{sub 3} trilayers by combined polarized neutron reflectometry, aberration-corrected microscopy, and atomic column resolution electron-energy-loss spectroscopy and x-ray absorption with polarization analysis. We find the same stacking sequence at both top and bottom cuprate interfaces. X-ray magnetic circular dichroism experiments show that both cuprate interfaces are magnetic with a magnetic moment induced in Cu atoms as expected from symmetric Mn-O-Cu superexchange paths. These results supply a solid footing for the applicability of recent theories explaining the interplay between magnetism and superconductivity in this system in terms of the induced Cu spin polarization at both interfaces.

Visani, C. [Universidad Complutense, Spain; Tornos, J. [Universidad Complutense, Spain; Nemes, Norbert [Universidad Complutense, Spain; Rocci, M. [Universidad Complutense, Spain; Leon, C. [Universidad Complutense, Spain; Santamaria, J. [Universidad Complutense, Spain; te Velthuis, G. E. [Argonne National Laboratory (ANL); Liu, Y. [Argonne National Laboratory (ANL); Hoffman, A. [Argonne National Laboratory (ANL); Freeland, J. W. [Argonne National Laboratory (ANL); Garcia-Hernandez, M [Instituto de Ciencia de Materiales de Madrid (ICMM); Fitzsimmons, M. R. [Los Alamos National Laboratory (LANL); Kirby, B. J. [Los Alamos National Laboratory (LANL); Varela del Arco, Maria [ORNL; Pennycook, Stephen J [ORNL

2011-01-01T23:59:59.000Z

245

Optical properties of metallic (III, Mn)V ferromagnetic semiconductors in the infrared to visible range  

E-Print Network (OSTI)

, Texas 77843-4242, USA 2Institute of Physics, ASCR, Cukrovarnick? 10, 162 53 Praha 6, Czech Republic 3Department of Physics, University of Texas, Austin, Texas 78712-0264, USA 4Institute of Physics, Polish Academy of Sciences, al. Lotnik?w 32/46, PL-02... of ferromagnetic semiconductors based on (III, Mn)V materials.1?4 These materials have been the focus of intensive research over the recent years after nonequilibrium growth procedures5,6 have demonstrated the ability to achieve a ferromagnetic phase...

Hankiewicz, EM; Jungwirth, T.; Dietl, T.; Timm, C.; Sinova, Jairo.

2004-01-01T23:59:59.000Z

246

Intertwining of Frustration with Magneto-Elastic Coupling in the Multiferroic LuMnO3  

SciTech Connect

Residual magnetic frustration in the multiferroic LuMnO3 may be key towards understanding magneto-elastic coupling in hexagonal manganites. Critical magnetic scattering present well above the magnetic ordering temperature TN persists below, as observed by inelastic neutron scattering. The magnetic fluctuations are confined in two dimensions implied by the characteristic wavevector dependence of the magnetic structure factor that changes from symmetric to asymmetric across TN. The low dimensionality of the magnetic structure is also evident in the temperature dependence of the commensurate antiferromagnetic intensity which follows a mean field exponent of 0.2.

Yano, Shin-ichiro [University of Virginia] [University of Virginia; Louca, Despina [University of Virginia] [University of Virginia; Chi, Songxue [ORNL] [ORNL; Matsuda, Masaaki [ORNL] [ORNL; Copley, John R. D. [National Institute of Standards and Technology (NIST), Gaithersburg, MD] [National Institute of Standards and Technology (NIST), Gaithersburg, MD; Cheong, Sang-Wook [Rutgers University] [Rutgers University

2014-01-01T23:59:59.000Z

247

Evidence for a Cluster-Based Structure of AlPdMn Single Quasicrystals  

Science Journals Connector (OSTI)

For the first time quasicrystal surfaces produced by in situ cleavage in ultrahigh vacuum have been investigated by scanning tunneling microscopy. Twofold and fivefold surfaces of icosahedral AlPdMn single quasicrystals have been studied. The surfaces were found to be rough. Their structure is determined by cluster aggregates formed on the basis of an elementary cluster whose contrast behavior and diameter of about 1 nm point to the Mackay-type cluster. Crack propagation occurs along zones of lower strength between clusters. This supports the cluster approach to quasicrystal structure.

Ph. Ebert, M. Feuerbacher, N. Tamura, M. Wollgarten, and K. Urban

1996-10-28T23:59:59.000Z

248

Phase diagram of the spinel oxide MnV2O4  

Science Journals Connector (OSTI)

Magnetization, susceptibility, and heat-capacity measurements were carried out on MnV2O4 ceramic samples. The two main results are as follows: (i) a consistent set of experimental features provides strong support to the existence of two separate transitions in zero-field and (ii) beside the ferrimagnetic transition, the phase diagram in the H?T plane contains two first-order transition (FOT) lines, both connected to the magnetostructural transition temperature in zero field. The new FOT line found at low-H/low-T is discussed in terms of field-induced alignment within the structure of tetragonal domains.

Vincent Hardy; Yohann Brard; Christine Martin

2008-07-10T23:59:59.000Z

249

First principles approach to the magneto caloric effect: Application to Ni2MnGa  

SciTech Connect

The magneto-caloric effect (MCE) is a possible route to more efficient heating and cooling of residential and commercial buildings. The search for improved materials is important to the development of a viable MCE based heat pump technology. We have calculated the magnetic structure of a candidate MCE material: Ni2MnGa. The density of magnetic states was calculated with the Wang Landau statistical method utilizing energies fit to those of the locally self-consistent multiple scattering method. The relationships between the density of magnetic states and the field induced adiabatic temperature change and the isothermal entropy change are discussed. (C) 2011 American Institute of Physics.

Nicholson, Don M [ORNL; Odbadrakh, Khorgolkhuu [ORNL; Rusanu, Aurelian [ORNL; Eisenbach, Markus [ORNL; Brown, Greg [ORNL; Evans III, Boyd Mccutchen [ORNL

2011-01-01T23:59:59.000Z

250

Incommensurate magnetic structure in the orthorhombic perovskite ErMnO3  

SciTech Connect

By combining dielectric, specific heat, and magnetization measurements and high-resolution neutron powder diffraction, we have investigated the thermodynamic and magnetic and structural properties of the metastable orthorhombic perovskite ErMnO{sub 3} prepared by high-pressure synthesis. The system becomes antiferromagnetically correlated below 42 K and undergoes a lock-in transition at 28 K with propagation wave vector (0,k{sub b},0), which remains incommensurate at low temperature. The intercorrelation between the magnetic structure and electric properties and the role of the rare earth moment are discussed.

Ye, Feng [ORNL; Huang, Q. [National Institute of Standards and Technology (NIST); Wang, Y.-Q. [University of Houston, Houston; Sun, Y. Y. [University of Houston, Houston; Chu, C. W. [University of Houston, Houston; Fernandez-Baca, Jaime A [ORNL; Dai, Pengcheng [ORNL; Mook Jr, Herbert A [ORNL

2007-08-01T23:59:59.000Z

251

Re-entrant Spin Glass Behavior in Mn-rich YMnO3  

SciTech Connect

We use magnetism and specific heat measurements to investigate the hexagonal Mn-rich YMnO{sub 3}. It is found that upon cooling from a high temperature, the compound first orders antiferromagnetically at T{sub N} {approx} 72 K and then undergoes a re-entrant spin glass (RSG) transition at T{sub SG} {approx} 42 K. This RSG behavior results from the competition between the ferromagnetic interaction and the antiferromagnetic interaction, which is related to the intrinsic geometric magnetic frustration in this system.

Chen, W. R. [Chinese Academy of Sciences; Zhang, F. C. [Chinese Academy of Sciences; Miao, J. [Chinese Academy of Sciences; Xu, B. [Chinese Academy of Sciences; Dong, X. L. [Chinese Academy of Sciences; Cao, L. X. [Chinese Academy of Sciences; Qiu, X. G. [Chinese Academy of Sciences; Zhao, Bairu [Chinese Academy of Sciences; Dai, Pengcheng [University of Tennessee, Knoxville (UTK)

2005-01-01T23:59:59.000Z

252

Incommensurate magnetic structure in the orthorhombic perovskite ErMnO3  

SciTech Connect

By combining dielectric, specific heat, and magnetization measurements and high-resolution neutron powder diffraction, we have investigated the thermodynamic and magnetic and structural properties of the metastable orthorhombic perovskite ErMnO3 prepared by high-pressure synthesis. The system becomes antiferromagnetically correlated below 42 K and undergoes a lock-in transition at 28 K with propagation wave vector (0,kb,0), which remains incommensurate at low temperature. The intercorrelation between the magnetic structure and electric properties and the role of the rare earth moment are discussed.

Ye, Feng [ORNL; Lorenz, Bernd [ORNL; Huang, Q. [National Institute of Standards and Technology (NIST); Wang, Y. Q. [University of Houston, Houston; Sun, Y. Y. [University of Houston, Houston; Chu, C. W. [University of Houston, Houston; Fernandez-Baca, Jaime A [ORNL; Dai, Pengcheng [ORNL; Mook Jr, Herbert A [ORNL

2007-01-01T23:59:59.000Z

253

LiMn{sub 2}O{sub 4} nanoparticles anchored on graphene nanosheets as high-performance cathode material for lithium-ion batteries  

SciTech Connect

Nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets nanocomposite has been successfully synthesized by a one-step hydrothermal method without post-heat treatment. In the nanocomposite, LiMn{sub 2}O{sub 4} nanoparticles of 1030 nm in size are well crystallized and homogeneously anchored on the graphene nanosheets. The graphene nanosheets not only provide a highly conductive matrix for LiMn{sub 2}O{sub 4} nanoparticles but also effectively reduce the agglomeration of LiMn{sub 2}O{sub 4} nanoparticles. The nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets nanocomposite exhibited greatly improved electrochemical performance in terms of specific capacity, cycle performance, and rate capability compared with the bare LiMn{sub 2}O{sub 4} nanoparticles. The superior electrochemical performance of the nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets nanocomposite makes it promising as cathode material for high-performance lithium-ion batteries. - Graphical abstract: Nanocrystalline LiMn{sub 2}O{sub 4}/graphene nanosheets (GNS) nanocomposite exhibit superior cathode performance for lithium-ion batteries compared to the bare LiMn{sub 2}O{sub 4} nanoparticles. Display Omitted - Highlights: LiMn{sub 2}O{sub 4}/graphene nanocomposite is synthesized by a one-step hydrothermal method. LiMn{sub 2}O{sub 4} nanoparticles are uniformly anchored on the graphene nanosheets. The nanocomposite exhibits excellent cathode performance for lithium-ion batteries.

Lin, Binghui; Yin, Qing; Hu, Hengrun; Lu, Fujia [School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing, Jiangsu 210094 (China); Xia, Hui, E-mail: xiahui@njust.edu.cn [School of Materials Science and Engineering, Nanjing University of Science and Technology, Xiaolingwei 200, Nanjing, Jiangsu 210094 (China); Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094 (China)

2014-01-15T23:59:59.000Z

254

Effect of excess lithium on LiNi0.5Mn0.5O2+? and its electrochemistry as lithium insertion material  

Science Journals Connector (OSTI)

Layered LiNiMnO compounds were successfully synthesized by an emulsion drying method, in which the emulsion makes it possible to intermix cations in atomic scale and therefore leads to homogeneous and fine oxide products. The as-synthesized powders were crystallized into a well-ordered ?-NaFeO2 (R3? m) structure. The calculated lattice parameters varied by changing the lithium amounts. The lattice parameters of Li1.13Ni0.5Mn0.5O2+z showed smaller a- and c-axes comparing to those of the LiNi0.5Mn0.5O2, whereas the c/a ratio remained constant for Li1+xNi0.5Mn0.5O2+z (0?x?0.13) compounds. Comparing to LiNi0.5Mn0.5O2 and Li1+xNi0.5Mn0.5O2+z electrodes, the delivered capacity for the Li1.13Ni0.5Mn0.5O2+z was much higher that that of the LiNi0.5Mn0.5O2. The lithium excess Li1+xNi0.5Mn0.5O2+z sample exhibited very stable cyclability with high capacity of about 175 mA h (g oxide)?1 after the 50th cycle at 25 C (I=20 mA g?1) and 50 C (75.5 mA g?1), which indicates that structural stability of the lithium excess Li1+xNi0.5Mn0.5O2+z is superior to that of the stoichiometric LiNi0.5Mn0.5O2.

Seung-Taek Myung; Shinichi Komaba; Naoaki Kumagai

2004-01-01T23:59:59.000Z

255

Solid-State 55Mn NMR Spectroscopy of bis(?-oxo)dimanganese(IV) [Mn2O2(salpn)2], a Model for the Oxygen Evolving Complex in Photosystem II  

SciTech Connect

Given the obvious global energy needs, it has become imperative to develop a catalytic process for converting water to molecular oxygen and protons. Many have sought to understand the details of photosynthesis and in particular the water splitting reaction to help in the development of the appropriate catalysis.1-3 While the scientific community has made great strides towards this goal, it has fallen short at the critical stage of the determination of the structure associated with the oxygen evolving complex (OEC) within photosystem II (PSII).4,5 Despite the existence of x-ray structures of PSII,6-8 the best data we have for the structure of the OEC comes from models derived from EPR and EXAFS measurements.9-14 This experimental situation has led to collaborations with theoreticians to enable the development of models for the structure of the OEC where the experimental observables (EXAFS and magnetic resonance parameters) serve as constraints to the theoretical calculations. Of particular interest to this study is the observation of the S1 state of the Kok cycle15 where the core of the OEC can be described as a tetranuclear manganese cluster composed of Mn4OxCa. The simplest model for the OEC can be thought of as two Mn-pairs and a Ca2+ where each Mn-pair is antiferromagnetically coupled to its partner. We utilize the term "pair" to describe the Mn atoms within the OEC with the same oxidation state, which for the S1 state is (Mn2(III, III) and Mn2(IV, IV)).16 It is unclear as to the degree of interaction between the pairs as well as the role of the Ca2+. At cryogenic temperatures the S1 state of the OEC is diamagnetic and in principle amenable to solid-state NMR experiments.

Ellis, Paul D.; Sears, Jesse A.; Yang, Ping; Dupuis, Michel; Boron, Ted; Pecoraro, Vince; Stich, Troy; Britt, R. David; Lipton, Andrew S.

2010-12-01T23:59:59.000Z

256

Synthesis of LiCoMnO4 via a solgel method and its application in high power LiCoMnO4/Li4Ti5O12 lithium-ion batteries  

Science Journals Connector (OSTI)

A LiCoMnO4 (5V spinel) material has been synthesized by annealing a solgel precursor utilizing lithium acetate, cobalt acetate, manganese acetate, and citric acid. The as-prepared sample has been determined to be LiCo1.09Mn0.91O4 via inductive coupled plasma-atomic emission spectroscopy. The deviation of the molar ratio of Co/Mn from 1:1 is designed to minimize the amount of LiMn2O4 impurity in our sample. The produced spinel material possesses an initial discharge capacity of 87.1mAhg?1 with two voltage plateaus at 5.1 and 4.9V. The LiCo1.09Mn0.91O4 cathode has been assembled with a Li4Ti5O12 anode to form a full-cell which delivered a discharge capacity of 131.2mAhg?1, centered at 3.2V. It is of great interest that despite the low coulombic efficiency of the full-cell, it shows good cyclic performance. In addition, The LiCo1.09Mn0.91O4/Li4Ti5O12 cell shows an excellent rate capability, delivering a capacity of 84.2mAhg?1, corresponding to a high power density of 4.70kWkg?1 at the current density of 1700mAg?1.

Xingkang Huang; Min Lin; Qingsong Tong; Xiuhua Li; Ying Ruan; Yong Yang

2012-01-01T23:59:59.000Z

257

Low Dose Radiation Research Program: Regulation of NF-kB and MnSOD in Low  

NLE Websites -- All DOE Office Websites (Extended Search)

NF-kB and MnSOD in Low Dose Radiation-Induced Adaptive NF-kB and MnSOD in Low Dose Radiation-Induced Adaptive Responses in Mouse and Human Skin Cells Jian Jian Li School of Health Sciences, Purdue University West Lafayette, Indiana Why this Project? To determine if low dose ionizing radiation-induced adaptive responses in skin cells are mediated by activation of signaling networks. Project Goals To evaluate the signaling networks involving transcription factor NF-kB and the mitochondrial antioxidant protein MnSOD. To determine if NF-kB is activated by low dose radiation in vivo. To determine if NF-kB activation is critical in the pathways that produce adaptive responses. Experimental Approach Cells transfected with NF-kB luciferase responder genes will be used to define a dose-response relationship for activation of the NF-kB gene. NF-kB

258

Temperature dependence of the interfacial spin polarization of La2/3Sr1/3MnO3  

Science Journals Connector (OSTI)

We have measured the tunneling magnetoresistance (TMR) of magnetic tunnel junctions based on La2/3Sr1/3MnO3 and various barrier materials (SrTiO3, TiO2, LaAlO3). The interfacial spin polarization of La2/3Sr1/3MnO3 is derived from the TMR and we find that its temperature dependence strongly resembles that of the bulk magnetization and hardly depends on the barrier material. However, the apparent Curie temperature is some 60 K lower. This dependence contrasts with that of the spin polarization of a free La2/3Sr1/3MnO3 surface, as probed by spin-polarized photoemission [J.-H. Park et al., Phys. Rev. Lett. 81, 1953 (1998)], thus evidencing that surfaces and interfaces have very different properties in manganites.

V. Garcia, M. Bibes, A. Barthlmy, M. Bowen, E. Jacquet, J.-P. Contour, and A. Fert

2004-02-12T23:59:59.000Z

259

Towards consistent chronology in the early Solar System: high resolution 53Mn-53Cr chronometry for chondrules.  

SciTech Connect

New high-precision {sup 53}Mn-{sup 53}Cr data obtained for chondrules extracted from a primitive ordinary chondrite, Chainpur (LL3.4), define an initial {sup 53}Mn/{sup 55}Mn ratio of (5.1 {+-} 1.6) x 10{sup -6}. As a result of this downward revision from an earlier higher value of (9.4 {+-} 1.7) x 10{sup -6} for the same meteorite (Nyquist et al. 2001), together with an assessment of recent literature, we show that a consistent chronology with other chronometers such as the {sup 26}Al-{sup 26}Mg and {sup 207}Pb-{sup 206}Pb systems emerges in the early Solar System.

Yin, Q; Jacobsen, B; Moynier, F; Hutcheon, I D

2007-05-02T23:59:59.000Z

260

Depth-dependent magnetism in epitaxial MnSb thin films: effects of surface passivation and cleaning  

SciTech Connect

Depth-dependent magnetism in MnSb(0001) epitaxial films has been studied by combining experimental methods with different surface specificities: polarized neutron reflectivity, x-ray magnetic circular dichroism (XMCD), x-ray resonant magnetic scattering and spin-polarized low energy electron microscopy (SPLEEM). A native oxide {approx}4.5 nm thick covers air-exposed samples which increases the film's coercivity. HCl etching efficiently removes this oxide and in situ surface treatment of etched samples enables surface magnetic contrast to be observed in SPLEEM. A thin Sb capping layer prevents oxidation and preserves ferromagnetism throughout the MnSb film. The interpretation of Mn L{sub 3,2} edge XMCD data is discussed.

Aldous J. D.; Sanchez-Hanke C.; Burrows, C.W.; Maskery, I.; Brewer, M.S.; Hase, T.P.A.; Duffy, J.A.; Lees, M. Rs; Decoster, T.; Theis, W.; Quesada, A.; Schmid, A.K.; Bell, G.R.

2012-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Scalable High-Power Redox Capacitors with Aligned Nanoforests of Crystalline MnO2 Nanorods by High Voltage Electrophoretic Deposition  

Science Journals Connector (OSTI)

Scalable High-Power Redox Capacitors with Aligned Nanoforests of Crystalline MnO2 Nanorods by High Voltage Electrophoretic Deposition ... The scalable nanomanufacturing process is demonstrated by roll-printing an aligned forest of ?-MnO2 nanorods on a large flexible substrate (1 inch by 1 foot). ...

Sunand Santhanagopalan; Anirudh Balram; Dennis Desheng Meng

2013-02-01T23:59:59.000Z

262

Magnetic ordering in the spinel compound LiMn2-xLixO4,,x=0,0.04... John Gaddy,1  

E-Print Network (OSTI)

batteries , but the 300 K struc- tural phase transition no longer takes place, even though the CO transition; accepted 1 December 2008; published online 11 March 2009 The two B-site ions Mn3+ and Mn4-ordering transition at room temperature. On further cooling to below 66 K, the system develops long

Montfrooij, Wouter

263

A Novel Approach for the Synthesis and Characterization Studies of Mn 2 + -Doped CdS Nanocrystals by a Facile Microwave-Assisted Combustion Method  

Science Journals Connector (OSTI)

A simple and efficient microwave-assisted combustion method was developed to synthesize Mn 2+-doped CdS (Mn x Cd 1?xS: x= 0.0, 0.3, and 0.5) nanocrystallites. The study suggeste...

A. Manikandan; S. Arul Antony

2014-12-01T23:59:59.000Z

264

Free-Standing LiNi0.5Mn1.5O4/Carbon Nanofiber Network Film as Light-Weight and High-Power  

E-Print Network (OSTI)

Free-Standing LiNi0.5Mn1.5O4/Carbon Nanofiber Network Film as Light-Weight and High-Power Cathode Pure carbon nanofiber (CNF) network without LiNi0.5Mn1.5O4 was tested in the voltage window of 3.5-5 V

Zhou, Chongwu

265

An analysis of the effects of Mn{sup 2+} on oxidative phosphorylation in liver, brain, and heart mitochondria using state 3 oxidation rate assays  

SciTech Connect

Manganese (Mn) toxicity is partially mediated by reduced ATP production. We have used oxidation rate assays-a measure of ATP production-under rapid phosphorylation conditions to explore sites of Mn{sup 2+} inhibition of ATP production in isolated liver, brain, and heart mitochondria. This approach has several advantages. First, the target tissue for Mn toxicity in the basal ganglia is energetically active and should be studied under rapid phosphorylation conditions. Second, Mn may inhibit metabolic steps which do not affect ATP production rate. This approach allows identification of inhibitions that decrease this rate. Third, mitochondria from different tissues contain different amounts of the components of the metabolic pathways potentially resulting in different patterns of ATP inhibition. Our results indicate that Mn{sup 2+} inhibits ATP production with very different patterns in liver, brain, and heart mitochondria. The primary Mn{sup 2+} inhibition site in liver and heart mitochondria, but not in brain mitochondria, is the F{sub 1}F{sub 0} ATP synthase. In mitochondria fueled by either succinate or glutamate + malate, ATP production is much more strongly inhibited in brain than in liver or heart mitochondria; moreover, Mn{sup 2+} inhibits two independent sites in brain mitochondria. The primary site of Mn-induced inhibition of ATP production in brain mitochondria when succinate is substrate is either fumarase or complex II, while the likely site of the primary inhibition when glutamate plus malate are the substrates is either the glutamate/aspartate exchanger or aspartate aminotransferase.

Gunter, Thomas E., E-mail: thomas_gunter@urmc.rochester.ed [Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Gerstner, Brent, E-mail: brent_gerstner@urmc.rochester.ed [Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Lester, Tobias, E-mail: Tlester200@gmail.co [Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Wojtovich, Andrew P., E-mail: andrew_wojtovich@urmc.rochester.ed [Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Malecki, Jon, E-mail: jon_malecki@urmc.rochester.ed [Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Swarts, Steven G., E-mail: steven_swarts@urmc.rochester.ed [Department of Radiation Oncology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Brookes, Paul S., E-mail: paul_brookes@urmc.rochester.ed [Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Department of Anesthesiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Gavin, Claire E., E-mail: candegavin@aol.com; Gunter, Karlene K., E-mail: karlene_gunter@urmc.rochester.ed [Department of Biochemistry and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States)

2010-11-15T23:59:59.000Z

266

This chapter is divided into three sections. Section 7.1, `Trends', highlights possible links between factors which may govern the emergence of the HgMn phenomenon  

E-Print Network (OSTI)

Mn stars are represented by filled circles while normal stars are open squares. The solar abundance for HgMn stars are real. When synthesis was performed at solar abundance on the spectra of normal stars temperature. the solar value (Anders and Grevesse 1989) and HR7361 2.5oe m below the solar abundance, weight

Dworetsky, Mike

267

PVP-functionalized nanometre scale metal oxide coatings for cathode materials: successful application to LiMn2O4 spinel nanoparticlesw  

E-Print Network (OSTI)

PVP-functionalized nanometre scale metal oxide coatings for cathode materials: successful-MnO2, may react with the electrolyte, leading to passivating structural changes of the active material retention compared to the bare counterpart. Spinel LiMn2O4 cathodes have been studied for possible use in Li

Cho, Jaephil

268

Local Agency Project Manager Checklist The steps below follow those outlined in the Mn/DOT Utility Manual. A PDF of the manual  

E-Print Network (OSTI)

.mn.us/utility/files/pdf/contacts/contact-utility.pdf For state facilities include: Office of Electronic Communications (800-627-3529) http://www.dot.state.mn.us/oec/index Meeting ­ Steps 2 & 3 Recommended for complex projects (Required Between 20-45 Percent Plan Completion Complete and distribute minutes Mark the date of the Utility Information Meeting on your Utility

Minnesota, University of

269

Magnetic and chemical nonuniformity in Ga{sub 1-x}Mn{sub x}As films as probed by polarized neutron and x-ray reflectometry  

SciTech Connect

We have used complementary neutron and x-ray reflectivity techniques to examine the depth profiles of a series of as-grown and annealed Ga{sub 1-x}Mn{sub x}As thin films. A magnetization gradient is observed for two as-grown films and originates from a nonuniformity of Mn at interstitial sites, and not from local variations in Mn at Ga sites. Furthermore, we see that the depth-dependent magnetization can vary drastically among as-grown Ga{sub 1-x}Mn{sub x}As films despite being deposited under seemingly similar conditions. These results imply that the depth profile of interstitial Mn is dependent not only on annealing, but is also extremely sensitive to initial growth conditions. We observe that annealing improves the magnetization by producing a surface layer that is rich in Mn and O, indicating that the interstitial Mn migrates to the surface. Finally, we expand upon our previous neutron reflectivity study of Ga{sub 1-x}Mn{sub x}As, by showing how the depth profile of the chemical composition at the surface and through the film thickness is directly responsible for the complex magnetization profiles observed in both as-grown and annealed films.

Kirby, B. J.; Borchers, J. A.; Rhyne, J. J.; O'Donovan, K. V.; Velthuis, S. G. E. te; Roy, S.; Sanchez-Hanke, Cecilia; Wojtowicz, T.; Liu, X.; Lim, W. L.; Dobrowolska, M.; Furdyna, J. K. [Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211 (United States) and Manuel Lujan Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Manuel Lujan Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States) and Department of Physiology and Biophysics, University of California, Irvine, California 92697 (United States); Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States); National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States); Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States) and Institute of Physics of the Polish Academy of Sciences, 02-688 Warsaw (Poland); Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

2006-12-15T23:59:59.000Z

270

Character of states near the Fermi level in (Ga,Mn)As: Impurity to valence band crossover RID E-6453-2010  

E-Print Network (OSTI)

We discuss the character of states near the Fermi level in Mn-doped GaAs, as revealed by a survey of dc transport and optical studies over a wide range of Mn concentrations. A thermally activated valence-band contribution to dc transport, a...

Jungwirth, T.; Sinova, Jairo; MacDonald, A. H.; Gallagher, B. L.; Novak, V.; Edmonds, K. W.; Rushforth, A. W.; Campion, R. P.; Foxon, C. T.; Eaves, L.; Olejnik, E.; Masek, J.; Yang, S-R Eric; Wunderlich, J.; Gould, C.; Molenkamp, L. W.; Dietl, T.; Ohno, H.

2007-01-01T23:59:59.000Z

271

Synthesis, structural characterization and ferrimagnetic property of MnPS{sub 3} intercalated with nickel(II) cyclopolyamine complex cations  

SciTech Connect

Two new intercalation compounds were prepared by the reactions of Ni(II) cyclopolyamine complex cations with a preintercalate Mn{sub 1-x}PS{sub 3}K{sub 2x}(H{sub 2}O){sub y}, respectively, through 'ion exchange' process. Their structures were characterized by elemental analysis, X-ray powder diffraction and infrared spectroscopy. The lattice spacing increased 0.567 and 1.093nm with respect to the pristine MnPS{sub 3}. Ferrimagnetism of the intercalates was confirmed by SQUID experiment with T{sub c} at 40 and 33K, respectively.

Yang Kai [Department of Chemistry, Wuhan University, Luojia Hill, Wuhan City, Hubei Province 430072 (China); Su Xu [Department of Chemistry, Wuhan University, Luojia Hill, Wuhan City, Hubei Province 430072 (China); Zhang Xuan [Department of Chemistry, Wuhan University, Luojia Hill, Wuhan City, Hubei Province 430072 (China); Chen Xingguo [Department of Chemistry, Wuhan University, Luojia Hill, Wuhan City, Hubei Province 430072 (China); Fu Enqin [Department of Chemistry, Wuhan University, Luojia Hill, Wuhan City, Hubei Province 430072 (China)]. E-mail: fueq@chem.whu.edu.cn; Qin Jingui [Department of Chemistry, Wuhan University, Luojia Hill, Wuhan City, Hubei Province 430072 (China); Inokuchi, Makoto [Faculty of Science and Engineering, Department of Materials Science and Environmental Engineering, Tokyo University of Science, Yamaguchi 1-1-1 Daigaku-dori, Onoda, Yamaguchi 756-0884 (Japan)]. E-mail: inokuchi@ed.yama.tus.ac.jp; Kinoshita, Minoru [Faculty of Science and Engineering, Department of Materials Science and Environmental Engineering, Tokyo University of Science, Yamaguchi 1-1-1 Daigaku-dori, Onoda, Yamaguchi 756-0884 (Japan)

2004-11-01T23:59:59.000Z

272

Suppression of the thermal hysteresis in magnetocaloric MnAs thin film by highly charged ion bombardment  

E-Print Network (OSTI)

We present the investigation on the modifications of structural and magnetic properties of MnAs thin film epitaxially grown on GaAs induced by slow highly charged ions bombardment under well-controlled conditions. The ion-induced defects facilitate the nucleation of one phase with respect to the other in the first-order magneto-structural MnAs transition with a consequent suppression of thermal hysteresis without any significant perturbation on the other structural and magnetic properties. In particular, the irradiated film keeps the giant magnetocaloric effect at room temperature opening new perspective on magnetic refrigeration technology for everyday use.

Trassinelli, Martino; Eddrief, M; Etgens, V H; Gafton, V; Hidki, S; Lacaze, Emmanuelle; Lamour, Emily; Prigent, Christophe; Rozet, Jean-Pierre; Steydli, S; Zheng, Y; Vernhet, Dominique

2014-01-01T23:59:59.000Z

273

Suppression of the thermal hysteresis in magnetocaloric MnAs thin film by highly charged ion bombardment  

SciTech Connect

We present the investigation on the modifications of structural and magnetic properties of MnAs thin film epitaxially grown on GaAs induced by slow highly charged ions bombardment under well-controlled conditions. The ion-induced defects facilitate the nucleation of one phase with respect to the other in the first-order magneto-structural MnAs transition, with a consequent suppression of thermal hysteresis without any significant perturbation on the other structural and magnetic properties. In particular, the irradiated film keeps the giant magnetocaloric effect at room temperature opening new perspective on magnetic refrigeration technology for everyday use.

Trassinelli, M., E-mail: martino.trassinelli@insp.jussieu.fr; Marangolo, M.; Eddrief, M.; Etgens, V. H.; Gafton, V.; Hidki, S.; Lacaze, E.; Lamour, E.; Prigent, C.; Rozet, J.-P.; Steydli, S.; Zheng, Y.; Vernhet, D. [CNRS, UMR 7588, Institut des NanoSciences de Paris (INSP), F-75005 Paris (France); Sorbonne Universits, UPMC Univ. Paris 06, UMR 7588, INSP, F-75005 Paris (France)

2014-02-24T23:59:59.000Z

274

Room temperature ferromagnetism in Mn, Ni and Co ions doped Cu{sub 2}O nanorods  

SciTech Connect

Here we report the synthesis and characterization of Cu{sub 2}O nanorods doped with Mn, Ni and Co transition metal ions and the study of their magnetic properties. Synthesis of the nanorods was carried out by the modified polyol method. Powder X-ray diffraction patterns clearly showed them to be polycrystalline single phase material. They exhibited ferromagnetic behavior at room temperature, however no such behavior was observed for the reference undoped sample, which indicated that unintentionally introduced magnetic impurities were not responsible for the observed phenomenon. Ferromagnetic behavior was found to be dependent on the dopant concentration and increased consistently with its increment in the material. The total magnetic moments contribution was calculated for the dopant concentration and was found to be insignificant to account for the observed ferromagnetism, therefore it was suggested that ferromagnetism could have conjured up from the induced magnetic moment in the defects created as cation vacancies in the material. The presence of the defects was supported by the room temperature photoluminescence study which showed that intensity of the peaks was dependent on the dopant concentration and increased consistently with it. There was strong correlation between the magnitude of the photoluminescence peak and the observed ferromagnetic property in the doped samples. -- Graphical Abstract: Room temperature ferromagnetism was observed in the Cu{sub 2}O nanorods doped with Mn, Ni and Co ions. The origin seems to be the defects of cation vacancies created by the dopant ions. Display Omitted

Ahmed, Asar [Department of Chemistry, SL-214, Southern Lab, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh (India); Gajbhiye, Namdeo S., E-mail: nsg@iitk.ac.i [Department of Chemistry, SL-214, Southern Lab, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh (India)

2010-12-15T23:59:59.000Z

275

Modeling of grain growth behavior of S34MnV steel at elevated temperatures  

Science Journals Connector (OSTI)

S34MnV steel is widely used as a fundamental material in manufacturing crankshaft in diesel engine. However due to amount of addition of Manganese element in the steel coarse grain and mixed grain are commonly observed after long time heating during the forging passes in industrial practice which may seriously reduce the impact toughness of the material. In current study based on the observed microstructure of S34MnV steel at different temperatures and heating times an empirical model has been established which reflects the relationship between the final grain size and the initial grain size as well as heating temperature and holding time. This model has been validated by a scaled sample and we further represented a successful industrial application of this model to simulate the grain size distribution and evolution during a large crankthrow heating and forging process which evidences its practical and promising perspective of our model with an aim of widely promoting the mechanical properties heavy marine components.

Yiyi Li

2013-01-01T23:59:59.000Z

276

High-Frequency Resonance of A Weak Ferromagnet: MnCO3  

Science Journals Connector (OSTI)

The high-frequency resonance of MnCO3 in the canted state was found at 95.7 Gc/sec in zero field at 20.4K which corresponds to a uniaxial anisotropy energy of 31.410-3 cm-1. The frequency dependence of the resonance for magnetic fields parallel to the [111] direction and the angular dependence of the resonance for constant frequency were measured. The latter was found to be different from that of a pure antiferromagnet due to the anisotropic spin-spin interaction. At absolute zero we estimated the zero-field splitting to occur at approximately 132 Gc/sec. When the magnetic field was applied in the (111) plane, the resonance could not be observed due to broadening effects. The broadening effects were also large in magnetic fields smaller than 7 kG. MnCO3 is the first weak ferromagnet with anisotropic spin-spin interaction where the high-frequency branch has been found.

H. J. Fink and D. Shaltiel

1963-04-15T23:59:59.000Z

277

EPR in Mn2+ doped betaine calcium chloride dihydrate single crystals J. L. Ribeiro (1), J. C. Fayet (2), J. Emery (2), M. Pdzeril (2), J. Albers (3), A. Klpperpieper (3),  

E-Print Network (OSTI)

devil's staircase. In this paper we report a study of Electronic Paramagnetic Resonance of Mn2 + doped

Paris-Sud XI, Université de

278

Magnetization-induced optical nonlinearity in ferromagnetic GaMnAs Kang-Jeon Han, Ji-Hee Kim, Ki-Ju Yee, X. Liu, J. K. Furdyna, and F. Hache  

E-Print Network (OSTI)

Magnetization-induced optical nonlinearity in ferromagnetic GaMnAs Kang-Jeon Han, Ji-Hee Kim, Ki in photoinduced femtosecond magnetization rotation in ferromagnetic GaMnAs Appl. Phys. Lett. 94, 021101 (2009); 10.1063/1.3058765 Coherent control of magnetization precession in ferromagnetic semiconductor (Ga,Mn)As Appl. Phys. Lett. 93

Boyer, Edmond

279

Effects of Mn and Fe Levels on Bacillus subtilis Spore Resistance and Effects of Mn2+, Other Divalent Cations, Orthophosphate, and Dipicolinic Acid on Protein Resistance to Ionizing Radiation  

Science Journals Connector (OSTI)

...exposed to ionizing radiation in vitro display...response to dose, with increasing...doses of gamma radiation increase...within a narrow range of Mn concentrations...from gamma ray doses (15 kGy...resistance to ionizing radiation, desiccation...

Amanda C. Granger; Elena K. Gaidamakova; Vera Y. Matrosova; Michael J. Daly; Peter Setlow

2010-11-05T23:59:59.000Z

280

Unoccupied electronic states of icosahedral Al-Pd-Mn quasicrystals: Evidence of image potential resonance and pseudogap  

SciTech Connect

We study the unoccupied region of the electronic structure of the fivefold symmetric surface of an icosahedral (i) Al-Pd-Mn quasicrystal. A feature that exhibits parabolic dispersion with an effective mass of (1.150.1)me and tracks the change in the work function is assigned to an image potential resonance because our density functional calculation shows an absence of band gap in the respective energy region. We show that Sn grows pseudomorphically on i?Al?Pd?Mn as predicted by density functional theory calculations, and the energy of the image potential resonance tracks the change in the work function with Sn coverage. The image potential resonance appears much weaker in the spectrum from the related crystalline Al-Pd-Mn surface, demonstrating that its strength is related to the compatibility of the quasiperiodic wave functions in i?Al?Pd?Mn with the free-electron-like image potential states. Our investigation of the energy region immediately above EF provides unambiguous evidence for the presence of a pseudogap, in agreement with our density functional theory calculations.

Maniraj, M [UGC-DAE Confortium for Scientific Research; Rai, Abhishek [UGC-DAE Confortium for Scientific Research; Barman, S R [UGC-DAE Confortium for Scientific Research; Krajci, M [Slovak Academy of Sciences; Schlagel, Deborah L [Ames Laboratory; Lograsso, Thomas A [Ames Laboratory; Horn, K [Fritz-Haber-Institut der Max-Planck-Gesellschaft

2014-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Iron-based soft magnetic composites with MnZn ferrite nanoparticles coating obtained by solgel method  

E-Print Network (OSTI)

­gel method Shen Wu a , Aizhi Sun a,n , Wenhuan Xu a , Qian Zhang a , Fuqiang Zhai a , Philip Logan b , Alex A-ray spectroscopy and distribution maps show that the iron particle surface is covered with a thin layer of Mn compared with the epoxy resin coated samples at 10 kHz. The effects of heat treatment temperature

Volinsky, Alex A.

282

pH Effects on the structure of biogenic Mn-oxides Mengqiang Zhu, mzhu@UDel.Edu1  

E-Print Network (OSTI)

metals. In this study, pH effects were investigated in CaCl2 and NaCl solutions at pH 6, 7 and 8 for 48. The structure of BioMnOx preformed at pH 8 in a CaCl2 solution was not modified by lower pHs of the CaCl2

Sparks, Donald L.

283

Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2  

SciTech Connect

The appearance of unconventional superconductivity often requires the suppression of an antiferromagnetic (AFM) ordered state by tuning the chemical composition. In BaFe2As2, the AFM ordered state is driven by Fermi surface nesting, resulting in stripe magnetic ordering with propagation vector Qstripe = (; 0) (in Fe square lattice notation). Co substitution acts as an electron donor that destabilizes the nesting condition,1 leading to suppression of the stripe AFM ordering2 and the appearance of superconductivity.3,4 Mn is nominally the hole-doping counterpart of Co which should also detune the Fermi surface nesting, but it is not a superconductor.5 Here we report that Mn doping does not act solely as a hole donor, but instead introduces strong spin uctuations at a wavevector (; ) that is unrelated to the Fermi surface topology of BaFe2As2. Spin uctuations at (; ) and (; 0) coexist, suggesting the Mn dopants act as local magnetic impurities that polarize neighbouring Fe/Mn spins, potentially disrupting superconductivity.

Pratt, Daniel [Ames Laboratory and Iowa State University; Kim, M. G. [Ames Laboratory and Iowa State University; Ran, S. [Ames Laboratory and Iowa State University; Thaler, A. [Ames Laboratory and Iowa State University; Granroth, Garrett E [ORNL; Marty, Karol J [ORNL; Tian, W. [University of Tennessee, Knoxville (UTK); Zarestky, J. L. [Ames Laboratory and Iowa State University; Lumsden, Mark D [ORNL; Budko, S L [Ames Laboratory and Iowa State University; Canfield, P. C. [Ames Laboratory; Goldman, A. I. [Ames Laboratory and Iowa State University; Mcqueeney, R J [Ames Laboratory and Iowa State University; Tucker, G. S. [Ames Laboratory and Iowa State University

2012-01-01T23:59:59.000Z

284

EXAFS and FT-IR Characterization of Mn and Li Promoted Titania-Supported Rh Catalysts for CO Hydrogenation  

SciTech Connect

The effect of Li and Mn promoters on the structure and selectivity of supported Rh catalysts for CO hydrogenation reaction was examined. Infrared spectroscopy and X-ray absorption were used to investigate the adsorption of reactants and local structure of Rh. These techniques were used in combination with reactivity, H{sub 2} chemisorption, and temperature programmed studies to correlate structural characteristics with activity and selectivity during CO hydrogenation of unpromoted Rh/TiO{sub 2} and three promoted Rh catalysts: Rh-Li/TiO{sub 2}, Rh-Mn/TiO{sub 2}, and Rh-Li-Mn/TiO{sub 2}. The presence of a promoter slightly decreases the Rh clusters size; however, no evidence for an electronic effect induced by the presence of Li and Mn was found. Higher turnover frequencies were found for the promoted catalysts, which also showed the lower dispersion. The Li promoter introduces a weakened CO adsorption site that appears to enhance the selectivity to C{sub 2+} oxygenates. The selectivity to C{sub 2+} oxygenates varies inversely with the reducibility of Rh metal, that is, the lower the Rh reducibility, the higher the selectivity.

V Schwartz; A Campos; A Egbebi; J Spivey; S Overbury

2011-12-31T23:59:59.000Z

285

Helical screw type magnetic structure of the multiferroic CaMn7O12 with low Cu-doping  

Science Journals Connector (OSTI)

The modulated crystal structure and modulated magnetic ordering of the multiferroic CaCuxMn7-xO12 is studied by analysing neutron and synchrotron-radiation powder diffraction data with a model based on the magnetic superspace group R31'(00)ts.

Slawinski, W.

2012-05-04T23:59:59.000Z

286

High-Energy Cathode Materials (Li2MnO3LiMO2) for Lithium-Ion Batteries  

Science Journals Connector (OSTI)

High-Energy Cathode Materials (Li2MnO3LiMO2) for Lithium-Ion Batteries ... Fabrication of Nitrogen-Doped Holey Graphene Hollow Microspheres and Their Use as an Active Electrode Material for Lithium Ion Batteries ... Li-rich materials are considered the most promising for Li-ion battery cathodes, as high energy densities can be achieved. ...

Haijun Yu; Haoshen Zhou

2013-03-28T23:59:59.000Z

287

Sulfur/mesoporous carbon composites combined with ?-MnS as cathode materials for lithium/sulfur batteries  

Science Journals Connector (OSTI)

The working cathode was composed of active materials (S/MnS/MC) (80wt.%...6, 10wt.%). N-methyl pyrrolidone (80wt.%) was added and grounded for 4h. The resultant slurry was coated onto an aluminum foil with th...

J. D. Liu; X. S. Zheng; Z. F. Shi; S. Q. Zhang

2014-05-01T23:59:59.000Z

288

Bioaccumulation of essential metals (Co, Mn and Zn) in the king scallop Pecten maximus: seawater, food and sediment exposures  

E-Print Network (OSTI)

, food and sediment exposures Marc Metiana,b , Michel Warnaua* , Laetitia Hédouina,b , Paco Bustamanteb-feeding mollusks living in soft sediments, the uptake and depuration kinetics of three elements (Co, Mn and Zn) were investigated in the king scallop Pecten maximus exposed via seawater, food, or sediment, using

Boyer, Edmond

289

Wavelengths and oscillator strengths of Xe II from the UVES spectra of four HgMn stars  

E-Print Network (OSTI)

In spite of large overabundances of Xe II observed in numerous mercury-manganese (HgMn) stars, Xe II oscillator strengths are only available for a very limited number of transitions. As a consequence, several unidentified lines in the spectra of HgMn stars could be due to Xe II. In addition, some predicted Xe II lines are redshifted by about 0.1 A from stellar unidentified lines, raising the question about the wavelength accuracy of the Xe II line data available in the literature. For these reasons we investigated the Xe II lines lying in the 3900-4521 A, 4769-7542 A, and 7660-8000 A spectral ranges of four well-studied HgMn stars. We compared the Xe II wavelengths listed in the NIST database with the position of the lines observed in the high-resolution UVES spectrum of the xenon-overabundant, slowly rotating HgMn stars HR 6000, and we modified them when needed. We derived astrophysical oscillator strengths for all the Xe II observed lines and compared them with the literature values, when available. In this...

Yce, K; Hubrig, S

2011-01-01T23:59:59.000Z

290

Transport properties of La1?xCaxMnO3 (Eur. Phys. J. B 26, 467?471...  

NLE Websites -- All DOE Office Websites (Extended Search)

Societ a Italiana di Fisica Springer-Verlag 2002 Transport properties of La 1-x Ca x MnO 3 (0.5 x < 1) H.-D. Zhou, R.-K. Zheng, G. Li, S.-J. Feng, F. Liu, X.-J. Fan,...

291

Physica B 322 (2002) 236247 The electronic properties of FeCo, Ni3Mn and Ni3Fe  

E-Print Network (OSTI)

1. Introduction The Fe- and Mn-based transition metal (TM) alloys possess a number of unusual with the local-density functional method. It is shown that the value of the magnetic moment is insensitive- stant and magnetization of Fe­Co alloys depend non-monotonically on Co concentration, and change

Kim, Jai Sam

292

Functional carbon nanotube/mesoporous Carbon/MnO2 hybrid network for high-performance supercapacitors  

Science Journals Connector (OSTI)

A functional carbon nanotube/mesoporous carbon/MnO2 hybrid network has been developed successfully through a facile route. The resulting composites exhibited a high specific capacitance of 351 F/g at 1 Ag-1, with intriguing charge/discharge ...

Tao Tao, Ling Zhang, Hao Jiang, Chunzhong Li

2014-01-01T23:59:59.000Z

293

Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic Heusler alloy Cu2MnAl  

E-Print Network (OSTI)

Evidence for triplet superconductivity in Josephson junctions with barriers of the ferromagnetic have studied Josephson junctions with barriers prepared from the Heusler compound Cu2MnAl. In the as metal. Measurements on lateral Josephson junctions with half metallic CrO2 Ref. 7 and the rare

Martinis, John M.

294

Highly luminescent surface-passivated ZnS:Mn nanoparticles by a simple one-step synthesis  

E-Print Network (OSTI)

to the formation of an effective passivation layer induced by lithium, and consequent suppression enhancement afforded by the formation of the passivation layer induced by lithium addition was stud- ied ml , and Mn NO3 2 0.05 g and LiOH·H2O were prepared in distilled water. Zinc acetate solution

Park, Byungwoo

295

Novel synthesis process and structure refinements of Li4Mn5O12 for rechargeable lithium batteries  

Science Journals Connector (OSTI)

Well-crystallized Li4Mn5O12 powder with grain size of 0.10.4 ?m was prepared by heating a eutectic mixture of lithium acetate (LiOAc), and manganese nitrate (Mn(NO3)2), in an oxygen atmosphere. The structure of Li4Mn5O12 crystallites was found to be a cubic spinel using Rietveld refinement of both neutron and X-ray powder diffraction data. We confirmed that lithium ions occupy both the tetrahedral 8a sites, and part of the octahedral 16d sites, but not the 16c sites in the space group Fd3m, while all the manganese ions occupy the 16d sites. The lattice parameter was found to be sensitive to the synthesis temperature as a result of the variation in manganese valence. Samples prepared at 500 C showed better electrode performance. A rechargeable capacity of about 135 mAh/g for the cell Li/Li4Mn5O12 was obtained in the 2.53.6 V range of cell voltages.

Toshimi Takada; Hiroshi Hayakawa; Etsuo Akiba; Fujio Izumi; Bryan C. Chakoumakos

1997-01-01T23:59:59.000Z

296

High-temperature stability, structure and thermoelectric properties of CaMn1xNbxO3 phases  

E-Print Network (OSTI)

technologies such as solid oxide fuel cells, thermoelectric (TE) modules and high-temperature superconductorsHigh-temperature stability, structure and thermoelectric properties of CaMn1?xNbxO3 phases Laura diffraction and electron diffraction data. Thermogravi- metric heating/cooling studies showed a reversible

297

ccsd-00093858,version1-13Sep2006 APS/123-QED Cleaved surface of i-AlPdMn quasicrystals  

E-Print Network (OSTI)

a perfectly brittle behavior to a nanoductile one. PACS numbers: 62.20.Mk, 64.60.Ht, 68.35.Ct, 81.40.Np, 61 by Scanning Tun- neling Microscopy (STM) of cleaved i-AlPdMn samples in ultra high vacuum (UHV) were obtained

Paris-Sud XI, Université de

298

Body retention and tissue distribution of59Fe and 54Mn in newborn rats fed iron-supplemented cow's milk  

E-Print Network (OSTI)

Body retention and tissue distribution of59Fe and 54Mn in newborn rats fed iron-supplemented cow distribution has been studied in newborn rats. Six-day old rats, divided into three groups were artificially retention in newborn rats, whereas it enhanced 59Fe deposition in the liver and the intestinal wall and

Boyer, Edmond

299

X-ray magnetic circular dichroism in (Ge,Mn) compounds: experiments and modeling Samuel Tardif,1, 2,  

E-Print Network (OSTI)

X-ray magnetic circular dichroism in (Ge,Mn) compounds: experiments and modeling Samuel Tardif,1, 2: July 29, 2013) X-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectra at the L2),6 and x-ray spectroscopy (x-ray absorption spec- troscopy, XAS, and x-ray magnetic circular

300

Unraveling the voltage fade mechanism in layer Li-Mn-rich electrode: formation of the tetrahedral cations for spinel conversion  

SciTech Connect

Discovery of high-voltage layered lithium-and manganese-rich (LMR) composite oxide electrode has dramatically enhanced the energy density of current Li-ion energy storage systems. However, practical usage of these materials is currently not viable because of their inability to maintain a consistent voltage profile (voltage fading) during subsequent charge-discharge cycles. This report rationalizes the cause of this voltage fade by providing the evidence of layer to spinel-like (LSL) structural evolution pathways in the host Li1.2Mn0.55Ni0.15Co0.1O2 LMR composite oxide. By employing neutron powder diffraction, and temperature dependent magnetic susceptibility, we show that LSL structural rearrangement in LMR oxide occurs through a tetrahedral cation intermediate via: i) diffusion of lithium atoms from octahedral to tetrahedral sites of the lithium layer [(LiLioct LiLitet] which is followed by the dispersal of the lithium ions from the adjacent octahedral site of the metal layer to the tetrahedral sites of lithium layer [LiTM oct LiLitet]; and ii) migration of Mn from the octahedral sites of the transition metal layer to the permanent octahedral site of lithium layer via tetrahedral site of lithium layer [MnTMoct MnLitet MnLioct)]. The findings opens the door to the potential routes to mitigate this atomic restructuring in the high-voltage LMR composite oxide cathodes by manipulating the composition/structure for practical use in high-energy-density lithium-ion batteries.

Mohanty, Debasish [ORNL; Li, Jianlin [ORNL; Abraham, Daniel P [Argonne National Laboratory (ANL); Huq, Ashfia [ORNL; Payzant, E Andrew [ORNL; Wood III, David L [ORNL; Daniel, Claus [ORNL

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Thermodynamic and transport properties of single-crystal Yb{sub 14}MnSb{sub 11}  

SciTech Connect

Relatively large (up to 250 mg) single crystals of the intermetallic compound Yb{sub 14}MnSb{sub 11} have been prepared by a flux-growth technique. The results of thermodynamic and transport measurements of these samples are presented. The compound orders ferromagnetically at approximately T{sub C}=53{plus_minus}1K, with a magnetization consistent with the assignment Mn{sup 3+} (3d{sup 4}) and Yb{sup 2+} (4f{sup 14}). The Mn moments are local in nature, with the full effective and saturated moment of the Hund{close_quote}s rule spin-only ground state. The electrical resistivity has a metallic temperature dependence, with only a modest anisotropy. Room-temperature values of the resistivity are relatively high for an intermetallic compound: 1630{plus_minus}160 {mu}{Omega}cm and 1250{plus_minus}130 {mu}{Omega}cm for currents flowing approximately parallel and perpendicular to the {ital c} axis, respectively. There is a distinct loss of spin-disorder scattering in the resistivity at T{sub C}. From the heat capacity, a rough estimation of the magnetic entropy gives {Delta}S{sub M}{approx}12.1 J/mol K, the value in reasonable agreement with the expected {Delta}S{sub M}{approx}R ln 5 from the assignment of these moments. All of these data are consistent with a picture of Mn{sup 3+} local moments being coupled via conduction electrons. To this end, Yb{sub 14}MnSb{sub 11} appears to be analogous to local-moment rare-earth intermetallic compounds, and may point the way toward a class of 3d Kondo lattice compounds. {copyright} {ital 1999} {ital The American Physical Society}

Fisher, I.R.; Wiener, T.A.; Budko, S.L.; Canfield, P.C. [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)] [Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States); Chan, J.Y.; Kauzlarich, S.M. [Department of Chemistry, One Shields Avenue, University of California, Davis, California 95616 (United States)] [Department of Chemistry, One Shields Avenue, University of California, Davis, California 95616 (United States)

1999-06-01T23:59:59.000Z

302

Magnetic structure and spin excitations in BaMn2Bi2  

SciTech Connect

We present a single crystal neutron scattering study of BaMn2Bi2, a recently synthesized material with the same ThCr2Si2-type structure found in several Fe-based unconventional superconducting materials. We show long range magnetic order, in the form of a G-type antiferromagnetic structure, to exist up to 390 K with an indication of a structural transition at 100 K. Utilizing inelastic neutron scattering we observe a spin-gap of 16 meV, with spin-waves extending up to 55 meV. We find these magnetic excitations are well fit to a J1-J2-Jc Heisenberg model and present values for the exchange interactions. The spin wave spectrum appears to be unchanged by the 100 K structural phase transition.

Calder, Stuart A [ORNL; Saparov, Bayrammurad I [ORNL; Niedziela, Jennifer L [ORNL; Lumsden, Mark D [ORNL; Safa-Sefat, Athena [ORNL; Christianson, Andrew D [ORNL

2014-01-01T23:59:59.000Z

303

Surface structures of cleaved icosahedral Al-Pd-Mn single quasicrystals after heat treatment  

Science Journals Connector (OSTI)

Surfaces produced by in situ cleavage fracture in ultrahigh vacuum of Czochralski-grown icosahedral Al-Pd-Mn single quasicrystals were investigated by scanning tunneling microscopy and by scanning electron microscopy at ambient temperature and after heat treatments of up to 670 C. It is found that the evolution of the surface structure with temperature depends very sensitively on the local stoichiometry. In areas of suitable composition a cluster-subcluster structure similar to that observed at room temperature is maintained whereas in areas of slightly different composition a terrace structure atomically flat over relatively large areas develops. The results are discussed in the general framework provided by current models of quasicrystal formation.

Ph. Ebert, F. Yue, and K. Urban

1998-02-01T23:59:59.000Z

304

The role of the (111) texture on the exchange bias and interlayer coupling effects observed in sputtered NiFe/IrMn/Co trilayers  

SciTech Connect

Magnetic properties of sputtered NiFe/IrMn/Co trilayers grown on different seed layers (Cu or Ta) deposited on Si (100) substrates were investigated by magnetometry and ferromagnetic resonance measurements. Exchange bias effect and magnetic spring behavior have been studied by changing the IrMn thickness. As shown by X-ray diffraction, Ta and Cu seed layers provoke different degrees of (111) fcc-texture that directly affect the exchange bias and indirectly modify the exchange spring coupling behavior. Increasing the IrMn thickness, it was observed that the coupling angle between the Co and NiFe ferromagnetic layers increases for the Cu seed system, but it reduces for the Ta case. The results were explained considering (i) different anisotropies of the Co and IrMn layers induced by the different degree of the (111) texture and (ii) the distinct exchange bias set at the NiFe/IrMn and IrMn/Co interfaces in both systems. The NiFe and Co interlayer coupling angle is strongly correlated with both exchange bias and exchange magnetic spring phenomena. It was also shown that the highest exchange bias field occurs when an unstressed L1{sub 2} IrMn structure is stabilized.

Castro, I. L.; Nascimento, V. P.; Passamani, E. C.; Takeuchi, A. Y.; Larica, C. [Universidade Federal do Espirito Santo, Vitoria, ES 29075-910 (Brazil)] [Universidade Federal do Espirito Santo, Vitoria, ES 29075-910 (Brazil); Tafur, M. [Universidade Federal de Itajuba, Campus Itabira, Itabira, MG 37500-903 (Brazil)] [Universidade Federal de Itajuba, Campus Itabira, Itabira, MG 37500-903 (Brazil); Pelegrini, F. [Universidade Federal de Goias, Goiania, GO 74001-970 (Brazil)] [Universidade Federal de Goias, Goiania, GO 74001-970 (Brazil)

2013-05-28T23:59:59.000Z

305

Definitive evidence of interlayer coupling between Ga{sub 1-x}Mn{sub x}As layers separated by a nonmagnetic spacer  

SciTech Connect

We have used polarized neutron reflectometry to study the structural and magnetic properties of the individual layers in a series of AlGaAs:Be/Ga{sub 1-x}Mn{sub x}As/GaAs/Ga{sub 1-x}Mn{sub x}As multilayer samples. Structurally, we observe that the samples are virtually identical except for the GaAs spacer thickness (which varies from 3 to 12 nm), and confirm that the spacers contain little or no Mn. Magnetically, we observe that for the sample with the thickest spacer layer, the Ga{sub 1-x}Mn{sub x}As layer adjacent to the Be-doped AlGaAs cap has a temperature dependent magnetization very different from that of the other Ga{sub 1-x}Mn{sub x}As layer. However, as the spacer layer thickness is reduced, the temperature dependent magnetizations of the two Ga{sub 1-x}Mn{sub x}As layers become progressively more similar--a trend we find to be independent of the crystallographic direction along which spins are magnetized. These results definitively show that Ga{sub 1-x}Mn{sub x}As layers can couple across a nonmagnetic spacer and that such coupling depends on spacer thickness.

Kirby, B. J.; Borchers, J. A.; Liu, X.; Ge, Z.; Cho, Y. J.; Dobrowolska, M.; Furdyna, J. K. [NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States); Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

2007-11-15T23:59:59.000Z

306

Polarized X-Ray Absorption Spectroscopy of Single-Crystal Mn(V) Complexes Relevant to the Oxygen-Evolving Complex of Photosystem II  

SciTech Connect

High-valent Mn-oxo species have been suggested to have a catalytically important role in the water splitting reaction which occurs in the Photosystem II membrane protein. In this study, five- and six-coordinate mononuclear Mn(V) compounds were investigated by polarized X-ray absorption spectroscopy in order to understand the electronic structure and spectroscopic characteristics of high-valent Mn species. Single crystals of the Mn(V)-nitrido and Mn(V)-oxo compounds were aligned along selected molecular vectors with respect to the X-ray polarization vector using X-ray diffraction. The local electronic structure of the metal site was then studied by measuring the polarization dependence of X-ray absorption near-edge spectroscopy (XANES) pre-edge spectra (1s to 3d transition) and comparing with the results of density functional theory (DFT) calculations. The Mn(V)-nitrido compound, in which the manganese is coordinated in a tetragonally distorted octahedral environment, showed a single dominant pre-edge peak along the MnN axis that can be assigned to a strong 3dz2-4pz mixing mechanism. In the square pyramidal Mn(V)-oxo system, on the other hand, an additional peak was observed at 1 eV below the main pre-edge peak. This component was interpreted as a 1s to 3dxz,yz transition with 4px,y mixing, due to the displacement of the Mn atom out of the equatorial plane. The XANES results have been correlated to DFT calculations, and the spectra have been simulated using a TD (time-dependent)-DFT approach. The relevance of these results to understanding the mechanism of the photosynthetic water oxidation is discussed.

Yano, J.K.; Robblee, J.; Pushkar, Y.; Marcus, M.A.; Bendix, J.; Workman, J.M.; Collins, T.J.; Solomon, E.I.; George, S.D.; Yachandra, V.K.; /LBL, Berkeley /Copenhagen U. /Stanford U., Chem. Dept. /SLAC, SSRL

2007-10-16T23:59:59.000Z

307

Relation between crystal structures, electronic structures, and electrode performances of LiMn2?xMxO4 (M = Ni, Zn) as a cathode active material for 4V secondary Li batteries  

Science Journals Connector (OSTI)

We investigated the relation between the electrode performance and electronic states of LiMn2?xMxO4 (M=Ni, Zn) as cathode active materials for the 4V class of lithium secondary batteries. The cycle performance is improved by substitution of Mn with Ni or Zn. We obtained the electron density distribution by XRD using the MEM/Rietveld method. Moreover, we investigated the electronic states of LiMn1.75M0.25O4 (M=Mn, Ni, Zn) using first-principles calculation by the DV-X? method. The net charges of each atom, and the bond overlap populations of Li?O, Mn?O, Ni?O and Zn?O were calculated. From the results, Li has a high ionicity and the covalent bonding of the Mn?O of LiMn1.75M0.25O4 (M=Ni, Zn) is stronger than that of LiMn2O4. As a result of the DOS, the oxygen 2p orbital and Mn 3d orbital provides the overlap and the overlap of LiMn1.75M0.25O4 is greater than that of LiMn2O4.

Yuka Ito; Yasushi Idemoto; Yuka Tsunoda; Nobuyuki Koura

2003-01-01T23:59:59.000Z

308

Heteroepitaxial growth and surface structure of L1{sub 0}-MnGa(111) ultra-thin films on GaN(0001)  

SciTech Connect

L1{sub 0}-structured MnGa(111) ultra-thin films were heteroepitaxially grown on GaN(0001) under lightly Mn-rich conditions using molecular beam epitaxy. Room-temperature scanning tunneling microscopy (STM) investigations reveal smooth terraces and angular step edges, with the surface structure consisting primarily of a 2 2 reconstruction along with small patches of 1 2. Theoretical calculations were carried out using density functional theory, and the simulated STM images were calculated using the Tersoff-Hamman approximation, revealing that a stoichiometric 1 2 and a Mn-rich 2 2 surface structure give the best agreement with the observed experimental images.

Mandru, Andrada-Oana; Wang, Kangkang; Cooper, Kevin; Ingram, David C.; Smith, Arthur R. [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States)] [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States); Garcia Diaz, Reyes; Takeuchi, Noboru [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States) [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States); Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autnoma de Mxico, Apartado Postal 14, Ensenada Baja California, Codigo Postal 22800 (Mexico); Haider, Muhammad [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States) [Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701 (United States); Department of Physics, King Fahd University of Petroleum and Minerals, Dhahran, 31261 (Saudi Arabia)

2013-10-14T23:59:59.000Z

309

Strong room-temperature ferromagnetism of high-quality lightly Mn-doped ZnO grown by molecular beam epitaxy  

SciTech Connect

Strong room-temperature ferromagnetism is demonstrated in single crystalline Mn-doped ZnO grown by molecular beam epitaxy. With a low Mn concentration of 2 Multiplication-Sign 10{sup 19} cm{sup -3}, Mn-doped ZnO films exhibited room-temperature ferromagnetism with a coercivity field larger than 200 Oe, a large saturation moment of 6 {mu}{sub B}/ion, and a large residue moment that is {approx}70% of the saturation magnetization. Isolated ions with long range carrier mediated spin-spin coupling may be responsible for the intrinsic ferromagnetism.

Zuo Zheng; Zhou Huimei; Olmedo, Mario J.; Kong Jieying; Liu Jianlin [Quantum Structures Laboratory, Department of Electrical Engineering, University of California - Riverside, Riverside, California 92521 (United States); Beyermann, Ward P. [Department of Physics and Astronomy, University of California - Riverside, Riverside, California 92521 (United States); Zheng Jianguo [Laboratory for Electron and X-ray Instrumentation, California Institute for Telecommunications and Information Technology, University of California - Irvine, Irvine, California 92697 (United States); Xin Yan [NHMFL, Florida State University, 1800 E. Paul Dirac Dr., Tallahassee, Florida 32310-3706 (United States)

2012-09-01T23:59:59.000Z

310

Magneto-transport in LaTi{sub 1?x}Mn{sub x}O{sub 3}/SrTiO{sub 3} oxide heterostructures  

SciTech Connect

We report the growth of ultrathin film of Mn doped LaTiO{sub 3} on TiO{sub 2} terminated SrTiO{sub 3} (001) substrate by pulsed laser deposition (PLD) and their electrical transport characteristics including magnetoresistance (MR). Though the replacement of Mn in LaTiO{sub 3} at the Ti site in dilute limit does not affect the metallic behaviour of films but variation in resistance is observed. Normalised resistance behaviour is explained on the basis of variation in charge carriers and increased interaction between Mn atoms in the system under investigation.

Kumar, Pramod, E-mail: pramodnpl2011@gmail.com; Dogra, Anjana, E-mail: pramodnpl2011@gmail.com; Budhani, R. C., E-mail: pramodnpl2011@gmail.com [Quantum Phenomena and Applications Division, National Physical Laboratory (CSIR), Dr. K.S. Krishnan Marg, New Delhi-110012 (India)

2014-04-24T23:59:59.000Z

311

LiMnPO4 Nanoplate Grown via Solid-State Reaction in Molten Hydrocarbon for Li-ion Battery Cathode  

SciTech Connect

Electrochemically active LiMnPO4 nanoplates have been synthesized via novel single step solid state reaction in molten hydrocarbon. The LiMnPO4 prepared show unique porous nanoplate shape ~50nm in thickness with highly preferred crystallographic orientation. The reversible cycling of carbon coated LiMnPO4 show flat potential at 4.1 V vs. Li with specific capacity reaching up to 168mAh/g and excellent cycling performance using only galvanostatic charging / discharging mode.

Choi, Daiwon; Wang, Donghai; Bae, In-Tae; Xiao, Jie; Nie, Zimin; Wang, Wei; Viswanathan, Vilayanur V.; Lee, Yun Jung; Zhang, Jiguang; Graff, Gordon L.; Yang, Zhenguo; Liu, Jun

2010-08-11T23:59:59.000Z

312

Electronic Structure of the Mn(4)Ca Cluster in the Oxygen-Evolving Complex of Photosystem Ii Studied By Resonant Inelastic X-Ray Scattering  

SciTech Connect

Oxygen-evolving complex (Mn{sub 4}Ca cluster) of Photosystem II cycles through five intermediate states (S{sub i}-states, i=0--4) before a molecule of dioxygen is released. During the S-state transitions, electrons are extracted from the OEC, either from Mn or alternatively from a Mn ligand. The oxidation state of Mn is widely accepted as Mn{sub 4}(III{sub 2},IV{sub 2}) and Mn{sub 4}(III,IV{sub 3}) for S{sub 1} and S{sub 2} states, while it is still controversial for the S{sub 0} and S{sub 3} states. We used resonant inelastic X-ray scattering (RIXS) to study the electronic structure of Mn{sub 4}Ca complex in the OEC. The RIXS data yield two-dimensional plots that provide a significant advantage by obtaining both K-edge pre-edge and L-edge-like spectra simultaneously. The second energy dimension separates the pre-edge (1s to 3d) transitions from the main K-edge (1s to 4p), and thus more precise analysis is possible. The 1s2p RIXS final state electron configuration along the energy transfer axis is identical to conventional L-edge absorption spectroscopy and the RIXS spectra are therefore sensitive to the metal spin state. We have collected data from PS II samples in the each of the S-states and compared them with data from various inorganic Mn complexes. The spectral changes in the Mn 1s2p{sub 3/2} RIXS spectra between the S-states are small compared to those of the oxides of Mn and coordination complexes. The results indicate strong covalency for the electronic configuration in the OEC, and we conclude that the electron is transferred from a strongly delocalized orbital, compared to those in Mn oxides or coordination complexes. The magnitude for the S{sub 0} to S{sub 1}, and S{sub 1} to S{sub 2} transitions is twice as large as that during the S{sub 2} to S{sub 3} transition, indicating that the electron for this transition is extracted from a highly delocalized orbital with little change in charge density at the Mn atoms. The RIXS spectra of S{sub 0} and S{sub 3} states also showed characteristic features which were not clear from the K-edge spectroscopy.

Yano, J.; Pushkar, Y.; Messinger, J.; Bergmann, U.; Glatzel, P.; Yachandra, V.K.

2009-06-04T23:59:59.000Z

313

Structure and Magnetic Ordering of a 2-D MnII(TCNE)I(OH2) (TCNE = tetracyanoethylene) Organic-based Magnet (Tc = 171 K)  

SciTech Connect

Mn{sup II}(TCNE)I(OH{sub 2}) was isolated from the reaction of tetracyanoethylene (TCNE) and MnI{sub 2}(THF){sub 3}, and has a 2-D structure possessing an unusual, asymmetric bonded {mu}{sub 4}-[TCNE]{sup {sm_bullet}-}. Direct antiferromagnetic coupling between the S = 5/2 Mn{sup II} and S = 1/2 [TCNE]{sup {sm_bullet}-} leads to magnetic ordering as a canted antiferromagnet at a T{sub c} of 171 K.

S Lapidus; A McConnell; P Stephens; J Miller

2011-12-31T23:59:59.000Z

314

Electric resistance and magnetoresistance of a two-layer epitaxial heterostructure (30 nm)La0.67Ca0.33MnO3/(30 nm)La0.67Ba0.33MnO3  

Science Journals Connector (OSTI)

Two-layer epitaxial heterostructures (30 nm)La0.67Ca0.33MnO3/(30 nm)La0.67Ba0.33MnO3 (LCMO/LBMO) have been grown by laser deposition on single crystal (001)LaAlO3 (LAO) substrates. In this system, the upper (LCMO...

Yu. A. Boikov; V. A. Danilov

2005-12-01T23:59:59.000Z

315

Oxygen reduction at a stabilized zirconia interface with Y[sub 1-x]Ca[sub x]MnO[sub 3] or La[sub 1-x]Sr[sub x]MnO[sub 3] cathode materials  

SciTech Connect

Impedance spectroscopy, combined with an unbonded interface cell, has been used to assess oxygen reduction behavior at interfaces between an yttria-stabilized zirconia electrolyte and perovskite or platinum cathode materials. Intrinsic oxygen reduction specific activities of Y[sub 1-x]Ca[sub x]MnO[sub 3] (x = 0.5, 0.6 and 0.7) and La[sub 1-x]Sr[sub x]MnO[sub 3] (x = 0.1 and 0.3) were determined as a function of temperature and oxygen partial pressure, independent of the interface morphology. The overall cathodic interfacial polarization consists of two or more fundamental processes. In the temperature range of 900--1000C and in air, the operating conditions for a solid oxide fuel cell, charge transfer and oxygen dissociation processes were approximately equivalent relative to the overall oxygen reduction kinetics.

Youngblood, G.E.; Pederson, L.R.; Bates, J.L. (Pacific Northwest Lab., Richland, WA (United States)); Rupaal, A.S. (Western Washington Univ., Bellingham, WA (United States))

1993-05-01T23:59:59.000Z

316

Oxygen reduction at a stabilized zirconia interface with Y{sub 1-x}Ca{sub x}MnO{sub 3} or La{sub 1-x}Sr{sub x}MnO{sub 3} cathode materials  

SciTech Connect

Impedance spectroscopy, combined with an unbonded interface cell, has been used to assess oxygen reduction behavior at interfaces between an yttria-stabilized zirconia electrolyte and perovskite or platinum cathode materials. Intrinsic oxygen reduction specific activities of Y{sub 1-x}Ca{sub x}MnO{sub 3} (x = 0.5, 0.6 and 0.7) and La{sub 1-x}Sr{sub x}MnO{sub 3} (x = 0.1 and 0.3) were determined as a function of temperature and oxygen partial pressure, independent of the interface morphology. The overall cathodic interfacial polarization consists of two or more fundamental processes. In the temperature range of 900--1000C and in air, the operating conditions for a solid oxide fuel cell, charge transfer and oxygen dissociation processes were approximately equivalent relative to the overall oxygen reduction kinetics.

Youngblood, G.E.; Pederson, L.R.; Bates, J.L. [Pacific Northwest Lab., Richland, WA (United States); Rupaal, A.S. [Western Washington Univ., Bellingham, WA (United States)

1993-05-01T23:59:59.000Z

317

Lattice dynamics and the phase transition from the cubic phase to the tetragonal phase in the LaMnO3 crystal within the polarizable-ion model  

Science Journals Connector (OSTI)

The paper reports on the results of ab initio calculations of the static and dynamic properties of the LaMnO3...crystal with a perovskite structure in the cubic, rhombohedral, and orthorhombic phases. The calcula...

V. I. Zinenko; M. S. Pavlovski?

2007-09-01T23:59:59.000Z

318

Promotion of Mn(II) Oxidation and Remediation of Coal Mine Drainage in Passive Treatment Systems by Diverse Fungal and Bacterial Communities  

Science Journals Connector (OSTI)

...Oxidation and Remediation of Coal Mine Drainage in Passive Treatment...concentrations of dissolved Mn(II) from coal mine drainage (CMD). Studies...and throughout the world. In Appalachia, centuries of coal mining has left thousands of abandoned...

Cara M. Santelli; Donald H. Pfister; Dana Lazarus; Lu Sun; William D. Burgos; Colleen M. Hansel

2010-05-21T23:59:59.000Z

319

Preparation, characterizations and magnetic properties of doped barium hexaferrites BaFe12-2x Mn x Sn x O19 (x = 0.01.0)  

Science Journals Connector (OSTI)

A series of doped barium hexaferrites BaFe12-2x Mn x Sn x O19 (x = 0.01.0) particles were prepared by the co-precipitation/molt...

Jingping Wang ???; Chunli Wu; Tian Xia ??

2012-06-01T23:59:59.000Z

320

X-ray and neutron scattering studies of the Rb?MnF? and Cu???xMgx̳GeO? in an external magnetic field  

E-Print Network (OSTI)

This thesis presents results of two scattering studies of low dimensional magnetic materials. The first is a neutron scattering study of Rb2MnF4, a nearly ideal two-dimensional square lattice Heisenberg antiferromagnet ...

Christianson, Rebecca J. (Rebecca Jean), 1973-

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Glass-like recovery of antiferromagnetic spin ordering in a photo-excited manganite Pr0.7Ca0.3MnO3  

E-Print Network (OSTI)

of topological defects in a photo-excited charge-orderedspin ordering in a photo-excited manganite Pr 0.7 Ca 0.3 MnO3 following ultrafast photo-exitation. Our studies reveal a

Zhou, S.Y.

2014-01-01T23:59:59.000Z

322

The influence of lithium excess in the target on the properties andcompositions of Li1+x Mn2O4?? thin films prepared by PLD  

Science Journals Connector (OSTI)

LiMnO thin films were deposited by pulsed laser deposition (PLD) onto stainless steel substrates using targets containing different concentrations of added Li2O. The influence of the target composition on the s...

F. Simmen; T. Lippert; P. Novk; B. Neuenschwander; M. Dbeli

2008-11-01T23:59:59.000Z

323

Comparison of Small Polaron Migration and Phase Separation in Olivine LiMnPO? and LiFePO? using Hybrid Density Functional Theory  

E-Print Network (OSTI)

Using hybrid density functional theory based on the Heyd-Scuseria-Ernzerhof (HSE06) functional, we compared polaron migration and phase separation in olivine LiMnPO? to LiFePO?. The barriers for free hole and electron ...

Ong, Shyue Ping

324

Synthesis, radiolabeling and biodistribution studies of [99mTc(CO)3(MN-TZ-BPA)]+ in tumor-bearing mice  

Science Journals Connector (OSTI)

This study reports the synthesis, radiolabeling and preliminary biodistribution results of [99mTc(CO)3(MN-TZ-BPA)]+...in tumor-bearing mice. The novel nitroimidazole derivative was successfully synthesized by con...

Jianjun Wang; Yuan Tian; Xiaojiang Duan

2012-04-01T23:59:59.000Z

325

Synthesis and cycling behavior of LiMn2O4 cathode materials prepared by glycine-assisted sol-gel method for lithium secondary batteries  

Science Journals Connector (OSTI)

Spinel-type LiMn2O4 powders having submicron, narrow particle-size distribution and excellent phasepure particles have been synthesized at low temperatures from metal acetate aqueous solution containing glycine a...

Yang-Kook Sun; Dong-Won Kim; Sung-Ho Jin

1998-01-01T23:59:59.000Z

326

Strain modified/enhanced ferromagnetism in Mn{sub 3}Ge{sub 2} thin films on GaAs(001) and GaSb(001)  

SciTech Connect

Ferromagnetic Mn{sub 3}Ge{sub 2} thin films were successfully grown on GaAs(001) and GaSb(001) substrates using molecular beam epitaxy. The results of our work revealed that the substrate facilitates to modify magnetic and electrical properties of Mn{sub 3}Ge{sub 2} films due to tensile/compressive strain effect between films and substrates. The characteristic spin-flopping transition at around 150 K for the bulk Mn{sub 3}Ge{sub 2} disappeared completely for both samples. The antiferromagnetism below 150 K changed to ferromagnetism and retained above room temperature. The saturation magnetization was found to be 0.23 and 1.32 {mu}{sub B}/Mn atom at 10 K for the samples grown on GaSb(001) and GaAs(001), respectively.

Dang Duc Dung; Duong Van Thiet [Department of Physics, University of Ulsan, Ulsan 680-749 (Korea, Republic of); Department of General Physics, School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet Road, Ha Noi (Viet Nam); Feng Wuwei; Cho, Sunglae [Department of Physics, University of Ulsan, Ulsan 680-749 (Korea, Republic of); Park, In-Sung [Department of Materials Science and Engineering, Hanyang University, Seoul 133-791 (Korea, Republic of); Bo Lee, Sung [Department of Materials Science and Engineering, Seoul National University, Seoul 151-742 (Korea, Republic of)

2013-04-21T23:59:59.000Z

327

Direct micron-sized LiMn2O4 particle coating on LiCoO2 cathode material using surfactant  

E-Print Network (OSTI)

acid as a chelating agent until a viscous gel solution was observed. This solution was dried and fired used. The LiMn2O4 powders were ball-milled for 20 min in water (100 g) using 0.2 g of a polyacrylate dispersant, orotanR solution (chunghan Chem., Korea). The LiMn2O4 powder with orotanR was observed to be well

Cho, Jaephil

328

Short-Range Layered A-Site Ordering in Double Perovskites NaLaBB?O6 (B = Mn, Fe; B? = Nb, Ta)  

Science Journals Connector (OSTI)

The magnetic exchange interactions in NaLaFeTaO6 and NaLaFeNbO6 are antiferromagnetic, while they are ferromagnetic in NaLaMnTaO6 and NaLaMnNbO6. ... This work has benefited from the use of HIPD at the Lujan Center at Los Alamos Neutron Science Center, funded by DOE Office of Basic Energy Sciences. ...

Walid Dachraoui; Tao Yang; Chang Liu; Graham King; Joke Hadermann; Gustaaf Van Tendeloo; Anna Llobet; Martha Greenblatt

2011-04-14T23:59:59.000Z

329

LiMn2O4 cathode doped with excess lithium and synthesized by co-precipitation for Li-ion batteries  

Science Journals Connector (OSTI)

LiMn2O4 exhibits lower cost, acceptable environmental characteristics, and better safety properties than other positive-electrode (cathode) materials for lithium-ion batteries. In this study, excess Li doped Li1+xMn2O4 is synthesized by a well-mixed co-precipitation method with LiOH utilized as both the reactant and co-precipitation agent. The precursor is calcined for various heating times and temperatures to form a fine powder of a single spinel phase with different particle sizes, size distributions, and morphology. The minimum heating temperature is around 400C. For short heating periods, Mn2O3 impurity is observed, but disappears after longer heating times. The average particle size is in the range 28?m for powders calcined between 700 and 870C. The lattice parameter increases with increase in heating temperature. The electrochemical behavior of LiMn2O4 powder is examined by using test cells which consist of a cathode, a metallic lithium anode, and an electrolyte of 1M LiPF6 in a 1:1 (volume ratio) mixture of ethylene carbonate (EC) and dimethyl carbonate (DMC). Cells with cathodes of LiMn2O4, Li1.08Mn2O4 and Li1.1Mn2O4 give a capacity of 85, 109 and 126mAhg?1, respectively. The introduction of excess Li in LiMn2O4 apparently increases the capacity, and decreases significantly the rate of capacity degradation on chargedischarge cycling.

H.W Chan; J.G Duh; S.R Sheen

2003-01-01T23:59:59.000Z

330

Folic Acid-Conjugated MnO Nanoparticles as a T1 Contrast Agent for Magnetic Resonance Imaging of Tiny Brain Gliomas  

Science Journals Connector (OSTI)

Folic Acid-Conjugated MnO Nanoparticles as a T1 Contrast Agent for Magnetic Resonance Imaging of Tiny Brain Gliomas ... Detection of brain gliomas at the earliest stage is of great importance to improve the outcomes but remains the most challenging task. ... Accordingly, the in vivo MR images demonstrated that MnO-TETT-FA NPs could efficiently enhance the MRI contrast for tiny brain gliomas. ...

Ning Chen; Chen Shao; Yanming Qu; Shuai Li; Wei Gu; Tingting Zheng; Ling Ye; Chunjiang Yu

2014-10-21T23:59:59.000Z

331

Hall effect in La0.7Ce0.3MnO3+? films with variable oxygen content  

Science Journals Connector (OSTI)

Hall effects of the La0.7Ce0.3MnO3+? film, which is believed an electron-doped manganite, have been experimentally studied, and a positive normal Hall coefficient is observed below the Curie temperature when the oxygen content of the film varies in a wide range. These observations may be attributed to the presence of excessive oxygen and composition distribution in the film, which may occur companying tetravalent ion doping. Removing excessive oxygen drives the system into the electron-doping state, however, the resistivity increases monotonically with oxygen loss, and the metal-to-semiconductor transition typical for a hole-doped manganite disappears. These results suggest the determinative role of hole doping for the resistive and magnetic behaviors in La0.7Ce0.3MnO3+?.

D. J. Wang; J. R. Sun; S. Y. Zhang; G. J. Liu; B. G. Shen; H. F. Tian; J. Q. Li

2006-04-04T23:59:59.000Z

332

Perpendicular-to-Parallel Spin Reorientation in a Mn-Doped GaAs Quantum Canting or Phase Separation  

SciTech Connect

It is well known that the magnetic anisotropy in a compressively-strained Mn-doped GaAs film changes from perpendicular to parallel with increasing hole concentration p. We study this reorientation transition at T = 0 for a quantum well with Mn impurities confined to the z = 0 plane. With increasing p, the angle 0 that minimizes the energy E increases continuously from 0 (perpendicular anisotropy) to /2 (parallel anisotropy) within some range of p. The shape of Emin(p) suggests that the quantum well becomes phase separated with regions containing low hole concentrations and perpendicular moments interspersed with other regions containing high hole concentrations and parallel moments. However, consideration of the Coulomb energy costs associated with phase separation suggests that the true magnetic state in the transition region is canted with 0 < < /2.

Fishman, Randy Scott [ORNL; Reboredo, Fernando A [ORNL; Brandt, Alex B [ORNL; Moreno, Juana [University of North Dakota, Grand Forks

2007-01-01T23:59:59.000Z

333

Magnetoresistance and electronic structure of the half-metallic ferrimagnet BiCu3Mn4O12  

Science Journals Connector (OSTI)

A cubic ordered perovskite BiCu3Mn4O12 has been synthesized under 6GPa and 1000C. BiCu3Mn4O12 is a ferrimagnet with TC=350K and its saturated magnetic moment is 10.5?B?f.u. The material showed low-resistive metallic behavior and magnetoresistance (MR) below TC. Its MR was observed over a wide temperature range, and the low-field MR reached ?28% at 5K. An electronic structure calculation revealed that it had a half-metallic nature and that the large MR observed under a low magnetic field was attributed to a spin-polarized tunneling or spin-dependent scattering effect at grain boundaries.

Kazuhide Takata; Ikuya Yamada; Masaki Azuma; Mikio Takano; Yuichi Shimakawa

2007-07-23T23:59:59.000Z

334

Temperature-induced martensite in magnetic shape memory Fe{sub 2}MnGa observed by photoemission electron microscopy  

SciTech Connect

The magnetic domain structure in single crystals of a Heusler shape memory compound near the composition Fe{sub 2}MnGa was observed during phase transition by photoelectron emission microscopy at Beamline 11.0.1.1 of the Advanced Light Source. The behavior is comparable with recent observations of an adaptive martensite phase in prototype Ni{sub 2}MnGa, although the pinning in the recent work is an epitaxial interface and in this work the e#11;ective pinning plane is a boundary between martensitic variants that transform in a self-accommodating way from the single crystal austenite phase present at high temperatures. Temperature dependent observations of the twinning structure give information as to the coupling behavior between the magnetism and the structural evolution.

Jenkins, Catherine; Scholl, Andreas; Kainuma, R.; Elmers, Hans-Joachim; Omori, Toshihiro

2012-01-18T23:59:59.000Z

335

Structure and magnetism in strained Ge{sub 1-x-y}Sn{sub x}Mn{sub y} films grown on Ge(001) by low temperature molecular beam epitaxy  

SciTech Connect

In this letter, we study the structural and magnetic properties of Ge{sub 1-x-y}Sn{sub x}Mn{sub y} films grown on Ge(001) by low temperature molecular beam epitaxy using X-ray diffraction, high resolution transmission electron microscopy, and superconducting quantum interference device. Like in Mn doped Ge films, Mn atoms diffuse during the growth and aggregate into vertically aligned Mn-rich nanocolumns of a few nanometers in diameter. Transmission electron microscopy observations in plane view clearly indicate that the Sn incorporation is not uniform with concentration in Mn rich vertical nanocolumns lower than the detection limit of electron energy loss spectroscopy. The matrix exhibits a GeSn solid solution while there is a Sn-rich GeSn shell around GeMn nanocolumns. The magnetization in Ge{sub 1-x-y}Sn{sub x}Mn{sub y} layers is higher than in Ge{sub 1-x}Mn{sub x} films. This magnetic moment enhancement in Ge{sub 1-x-y}Sn{sub x}Mn{sub y} is probably related to the modification of the electronic structure of Mn atoms in the nanocolumns by the Sn-rich shell, which is formed around the nanocolumns.

Prestat, E. [INAC, SP2M, CEA and Universite Joseph Fourier, 17 rue des Martyrs, 38054 Grenoble (France); Karlsruher Institut fuer Technologie (KIT), Laboratorium fuer Elektronenmikroskopie, D-76128 Karlsruhe (Germany); Barski, A.; Bellet-Amalric, E.; Morel, R.; Tainoff, D.; Jain, A.; Porret, C.; Bayle-Guillemaud, P.; Jamet, M. [INAC, SP2M, CEA and Universite Joseph Fourier, 17 rue des Martyrs, 38054 Grenoble (France); Jacquot, J.-F. [INAC, SCIB, CEA and Universite Joseph Fourier, 17 rue des Martyrs, 38054 Grenoble (France)

2013-07-01T23:59:59.000Z

336

The origin and evolution of the odd-Z iron-peak elements Sc, V, Mn, and Co in the Milky Way stellar disk  

E-Print Network (OSTI)

AIMS: The aim of this study is to investigate the origin and evolution of Sc, V, Mn, and Co for a homogeneous and statistically significant sample of stars probing the different populations of the Milky Way, in particular the thin and thick disks. METHODS: Using high-resolution spectra obtained with MIKE, FEROS, SOFIN, FIES, UVES and HARPS spectrographs, we determine Sc, V, Mn, and Co abundances for a large sample of F and G dwarfs in Solar neighbourhood. The method is based on spectral synthesis and using one-dimensional (1-D), plane-parallel, LTE model stellar atmospheres calculated with the MARCS 2012 code. NLTE corrections from literature were applied to Mn and Co. RESULTS: We find that the abundance trends derived for Sc (594 stars), V (466 stars), and Co (567 stars) are very similar to what has been observed for the alpha-elements in the thin and thick disks. On the contrary Mn (569 stars) is generally underabundant relative to the Sun (i.e. [Mn/Fe]<0) for [Fe/H]<0. Also, for Mn, when NLTE correct...

Battistini, Chiara

2015-01-01T23:59:59.000Z

337

Observation of the large magnetocaloric effect and suppression of orbital entropy change in Fe-doped MnV{sub 2}O{sub 4}  

SciTech Connect

We present the structural and magnetic properties of Mn{sub 1?x}Fe{sub x}V{sub 2}O{sub 4} (x = 0.1, 0.2, and 0.3), and investigate the magnetocaloric effect in those compounds. The ferrimagnetic spin ordering is enhanced with the Fe doping at Mn site of MnV{sub 2}O{sub 4}, while the orbital ordering is suppressed. Large magnetic entropy changes up to 3.8 J/kg?K as well as the relative cooling power up to 110 J/kg at the field change of 0-2 T for Mn{sub 1?x}Fe{sub x}V{sub 2}O{sub 4} are calculated from the isothermal magnetization measurements. The large orbital entropy change of MnV{sub 2}O{sub 4} is suppressed by the Fe doping, while the spin entropy contribution arising from the strong spin-orbit coupling remains. Moreover, the doping of Fe broadens the temperature span of the large magnetic entropy change and increases the relative cooling power of MnV{sub 2}O{sub 4} by 2.4 times.

Huang, Z. H. [High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031 (China); Luo, X., E-mail: xluo@issp.ac.cn, E-mail: ypsun@issp.ac.cn; Hu, L.; Tan, S. G.; Liu, Y.; Yuan, B.; Chen, J.; Song, W. H. [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China and University of Science and Technology of China, Hefei 230026 (China); Sun, Y. P., E-mail: xluo@issp.ac.cn, E-mail: ypsun@issp.ac.cn [High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031 (China); Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China and University of Science and Technology of China, Hefei 230026 (China)

2014-01-21T23:59:59.000Z

338

Electrode Materials with the Na0.44MnO2 Structure: Effect ofTitanium Substitution on Physical and Electrochemical Properties  

SciTech Connect

The physical and electrochemical properties of LixMnO2 and LixTi0.11Mn0.89O2 synthesized from precursors made by glycine-nitrate combustion (GNC) and solid-state synthesis methods (SS) are examined in this paper. The highest specific capacities in lithium cells are obtained for SS-LixMnO2 electrodes at low current densities, but GNC-LixTi0.11Mn0.89O2 electrodes show the best high rate performance. These results can be explained by changes in the voltage characteristics and differences in the particle morphologies induced by the Ti-substitution and synthesis method. Ti-substitution also results in a decrease in the electronic conductivity, but greatly improves the thermal properties and imparts dissolution resistance to the electrode. For these reasons, it is preferable to use LixTi0.11MnO0.89O2 in lithium battery configurations rather than LixMnO2. Suggestions for improving the electrochemical performance of the Ti-substituted variant are given based on the results described herein.

Doeff, Marca M; Saint, Juliette A.; Doeff, Marca M; Wilcox, James D.

2008-03-10T23:59:59.000Z

339

Nanoscale analysis of a SrTiO3/La2/3Sr1/3MnO3 interface  

Science Journals Connector (OSTI)

The aim of the present work is an atomic scale characterization of the SrTiO3/La2/3Sr1/3MnO3 interface involved in Co/SrTiO3/La2/3Sr1/3MnO3 tunnel junctions. Our high-resolution transmission electron microscopy experiments show the quality of the pseudo-morphic growth of La2/3Sr1/3MnO3 (LSMO) and SrTiO3 (STO), but do not allow us to determine the termination of LSMO. On the other hand, we have carried out an energy-loss near-edge structure study of the Mn2p and O1s edges. The main result is that the valence of Mn keeps its intrinsic value of the bulk material till the last MnO2 layers at the interface, which is consistent with the observation of magnetoresistance up to practically the Curie temperature of bulk LSMO in our junctions. These results suggest a La2/3Sr1/3O termination of LSMO.

F. Pailloux, D. Imhoff, T. Sikora, A. Barthlmy, J.-L. Maurice, J.-P. Contour, C. Colliex, and A. Fert

2002-07-08T23:59:59.000Z

340

Isothermal calorimetry investigation of Li{sub 1+x}Mn{sub 2-y}Al{sub z}O{sub 4} spinel.  

SciTech Connect

The heat generation of LiMn{sub 2}O{sub 4}, Li{sub 1.156}Mn{sub 1.844}O{sub 4}, and Li{sub 1.06}Mn{sub 1.89}Al{sub 0.05}O{sub 4} spinel cathode materials in a half-cell system was investigated by isothermal micro-calorimetry (IMC). The heat variations of the Li/LiMn{sub 2}O{sub 4} cell during charging were attributed to the LiMn{sub 2}O{sub 4} phase transition and order/disorder changes. This heat variation was largely suppressed when the stoichiometric spinel was doped with excess lithium or lithium and aluminum. The calculated entropy change (dE/dT) from the IMC confirmed that the order/disorder change of LiMn{sub 2}O{sub 4}, which occurs in the middle of the charge, was largely suppressed with lithium or lithium and aluminum doping. The dE/dT values obtained did not agree between the charge and the discharge at room temperature (25 C), which was attributed to cell self-discharge. This discrepancy was not observed at low temperature (10 C). Differential scanning calorimeter (DSC) results showed that the fully charged spinel with lithium doping has better thermal stability.

Lu, W.; Belharouak, I.; Park, S. H.; Sun, Y. K; Amine, K.; Chemical Engineering; Hanyang Univ.

2007-05-25T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

MnSOD marks cord blood late outgrowth endothelial cells and accompanies robust resistance to oxidative stress  

SciTech Connect

Cord blood is source of colony-forming progenitors to vascular endothelial cells for potential use in cell therapies. These cells-called blood late outgrowth endothelial cells (OECs)-have undergone endothelial differentiation, but appear to still possess functional properties different from mature endothelial cells. A large-scale comparative proteomics screen of cord blood OECs versus human vein endothelial cells (HUVECs) using two-dimensional gel electrophoresis and mass spectrometry identified specific expression of manganese superoxide dismutase (MnSOD), a key antioxidant enzyme expressed in the mitochondria, in OECs but not in HUVECs. Immunoblotting verified significant MnSOD levels in all OEC isolates tested and maintained throughout passaging. Endothelial function and cell survival/proliferation assays in the presence of high cytotoxic doses of the superoxide generator compound LY83583 showed OECs profoundly better protected against oxidative stress than HUVECs. Such cytoprotective levels of MnSOD cells could give therapeutic cell transplants a survival advantage in necrotic or ischemic conditions.

Cai Hao [Department of Obstetrics, University Hospital Zurich (Switzerland); Gehrig, Peter [Functional Genomics Center Zurich, University of Zurich, Swiss Federal Institute of Technology, Zurich (Switzerland); Scott, Thomas M. [Functional Genomics Center Zurich, University of Zurich, Swiss Federal Institute of Technology, Zurich (Switzerland); Zimmermann, Roland [Department of Obstetrics, University Hospital Zurich (Switzerland); Schlapbach, Ralph [Functional Genomics Center Zurich, University of Zurich, Swiss Federal Institute of Technology, Zurich (Switzerland); Zisch, Andreas H. [Department of Obstetrics, University Hospital Zurich (Switzerland) and Center for Integrative Human Physiology, University of Zurich, Zurich (Switzerland)]. E-mail: andreas.zisch@usz.ch

2006-11-17T23:59:59.000Z

342

Magnetoelectric coupling tuned by competing single iron anisotropies in Mn1 xNixTiO3  

SciTech Connect

A flop of electric polarization from Pc to Pa is observed in MnTiO3 as a spin flop transtion is triggered by a c-axis magnetic field, Hc=7 T. The critical magnetic field for Pa is significantly reduced in Mn1 xNixTiO3 (x=0.33). Neutron diffraction measurements revealed similar magnetic arrangements for the two compositions where the ordered spins couple antiferromagnetically with their nearest intra- and inter-planar neighbors. In the x=0.33 system, the single ion anisotropies of Mn2+ and Ni2+ compete and give rise to an additional spin reorientation transition at TR. A magnetic field, Hc, aligns the spins along c for TR

Chi, Songxue [ORNL; Ye, Feng [ORNL; Zhou, Haidong [ORNL; Choi, E. S. [National High Magnetic Field Laboratory (Magnet Lab), Florida; Cao, Huibo [ORNL; Hwang, J. [National High Magnetic Field Laboratory (Magnet Lab), Florida; Fernandez-Baca, Jaime A [ORNL; Hwang, J [Florida State University, Tallahassee

2014-01-01T23:59:59.000Z

343

Effect of Sb incorporation on structure and magnetic properties of quaternary ferromagnetic semiconductor (Ga, Mn)(As, Sb) thin films  

SciTech Connect

GaAs-based quaternary ferromagnetic semiconductor (Ga, Mn)(As, Sb) has been successfully prepared by molecular-beam epitaxy. High-resolution x-ray diffraction measurements indicate that the lattice constant has a notable alteration with changing Sb content. Magnetic measurements demonstrate the same evolution of the Curie temperature T{sub C} and the effective Mn content x{sub eff} with increasing Sb content. The incorporation of low Sb content is of benefit to increasing x{sub eff}, thus, increasing T{sub C}. However, higher Sb content degrades the crystal quality, resulting in a decrease of x{sub eff}. Experimental results show that T{sub C} is proportional to the product of x{sub eff} and p{sup 1/3}, which is consistent with the Zener Model. The exchange energy N{sub 0}? is calculated to be ?1.09 eV, which is similar to that of (Ga, Mn)As.

Deng, J. J.; Che, J. T.; Chen, J.; Wang, W. J.; Hu, B. [Mathematics and Physics Department, North China Electric Power University, Beijing 102206 (China)] [Mathematics and Physics Department, North China Electric Power University, Beijing 102206 (China); Wang, H. L.; Zhao, J. H. [Institute of Semiconductors, State Key Laboratory of Superlattices and Microstructures, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China)] [Institute of Semiconductors, State Key Laboratory of Superlattices and Microstructures, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083 (China)

2013-12-28T23:59:59.000Z

344

Facile synthesis of MnO and nitrogen-doped carbon nanocomposites as anode material for lithium ion battery  

Science Journals Connector (OSTI)

Abstract MnO and nitrogen-doped carbon (N-C) nanocomposites have been successfully synthesized by a facile thermal-decomposing method using the mixture of glycine and manganese acetate as precursor. As anode material for lithium-ion batteries (LIBs), electrochemical results show that the as-prepared MnO/N-C achieves a reversible capacity of 473mAhg?1 after 50 cycles at a current density of 100mAg?1 and the capacities of 631.4, 547.7, 443.1, 294.7, and 161.8mAhg?1 at the current densities of 100, 200, 400, 800, and 1600mAg?1, respectively. The superior cycling and rate performances is attributed to the nanocomposite structure, in which nanosized MnO particles shorten the diffusion path of lithium ions and the N-doped carbon cushions the volume change and improves the electronic conductivity of electrode.

Song Qiu; Xinzhen Wang; Guixia Lu; Jiurong Liu; Cuizhu He

2014-01-01T23:59:59.000Z

345

Neutron diffraction studies on the Heusler alloy Ni{sub 50}Mn{sub 37}Sb{sub 13}  

SciTech Connect

The evolution of martensitic to austenitic transformation in Ni{sub 50}Mn{sub 37}Sb{sub 13} has been studied usingtemperature dependent neutron diffraction, thermal property, and magnetization studies. Differential scanning calorimetric studies reveal a martensitic transformation T{sub M} around 291 K. The magnetization data yield a ferromagnetic ordering temperature of 329 K in the austenitic phase and 230 K in the martensitic phase. The analysis of the powder neutron diffraction data in the temperature range of 325-12 K indicates a structural transition from a high temperature cubic L2{sub 1} type structure to an orthorhombic structure. At 270 K, both cubic and orthorhombic phases coexist. Anisotropic unit cell changes are observed at the martensitic transformation: The unit cell expands by about 1.5% along the a axis, by about 2.5% along the c axis, and compresses by about 4.28% along the b axis. Both cubic and orthorhombic phases show commensurate collinear ferromagnetic ordering with a magnetic moment of {approx}3.67 {mu}{sub B}/Mn in Mn (2a and 2f) sites.

Rama Rao, N. V.; Chelvane, J. Arout; Chandrasekaran, V. [Defence Metallurgical Research Laboratory, Hyderabad 500 058 (India); Morozkin, A. V. [Department of Chemistry, Moscow Lomonosov State University, Moscow 119992 (Russian Federation); Lamsal, J. [Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, Missouri 65211 (United States); Yelon, W. B. [Materials Research Center and Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409 (United States); Nirmala, R. [Department of Physics, Indian Institute of Technology Madras, Chennai 600 036 (India); Suresh, K. G. [Department of Physics, Indian Institute of Technology Bombay, Mumbai 400 076 (India); Malik, S. K. [International Institute of Physics (IIP)-UFRN, Natal, 59072-970 (Brazil)

2011-04-01T23:59:59.000Z

346

RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT_CODE","PORT_CITY  

U.S. Energy Information Administration (EIA) Indexed Site

RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT_CODE","PORT_CITY","PORT_STATE","PORT_PADD","GCTRY_CODE","CNTRY_NAME","QUANTITY","SULFUR","APIGRAVITY","PCOMP_RNAM","PCOMP_SNAM","PCOMP_STAT","STATE_NAME","PCOMP_PADD" RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT_CODE","PORT_CITY","PORT_STATE","PORT_PADD","GCTRY_CODE","CNTRY_NAME","QUANTITY","SULFUR","APIGRAVITY","PCOMP_RNAM","PCOMP_SNAM","PCOMP_STAT","STATE_NAME","PCOMP_PADD" 41547,"AEROPRES CORP ",1,253,"Isobutane/Ngl",3402,"NOYES, MN","MINNESOTA",2,260,"CANADA",2,0,0,,,,," " 41547,"AEROPRES CORP ",2,252,"Normal Butane/Ngl",3402,"NOYES, MN","MINNESOTA",2,260,"CANADA",5,0,0,,,,," "

347

Critical fluctuations in MnSi near T{sub C}: A polarized neutron scattering study  

SciTech Connect

Results of polarized neutron small angle scattering in MnSi, a cubic itinerant magnet, near T{sub c}=28.8 K are presented and analyzed. The diffuse scattering intensity looks like half-moons oriented along the incident neutron polarization. The sum of the intensities for two opposite polarizations form an anisotropic ring with weak spots, which below T{sub c} transform into the Bragg peaks originating from the helical structure. These results are in semiquantitative agreement with the mean-field calculations based on the Bak-Jensen model that takes into account the hierarchy of the interactions: the exchange interaction, the isotropic Dzyaloshinskii-Moriya (DM) interaction and the weak anisotropic exchange (AE) interaction. The DM interaction is responsible for the scattering intensity concentrated in the half-moons. The AE interaction provides the anisotropy so that the correlation length diverges along [111] only. The corresponding critical exponent is {nu}=0.62(1). The exponent of the Bragg intensity due to the helical structure at T

Grigoriev, S.V.; Maleyev, S.V.; Okorokov, A.I.; Chetverikov, Yu.O. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188300 (Russian Federation); Georgii, R.; Boeni, P.; Lamago, D. [ZWE FRM-II/E21, Technische Universitaet Muenchen, 85747 Garching (Germany); Eckerlebe, H.; Pranzas, K. [GKSS Forschungszentrum, 21502 Geesthacht (Germany)

2005-10-01T23:59:59.000Z

348

High density nanoparticle Mn-Zn ferrite synthesis, characterisation and magnetic properties  

Science Journals Connector (OSTI)

The amazing magnetic properties exhibited by nanoparticles Mn-Zn ferrites and their promising technological and medical applications have attracted much interest in recent years. Nanoparticle Mnx Zn(1-x)Fe2O4 spinel ferrites with x = 0.6/0.63/0.65/0.67/0.7 were synthesised by the nitrilotriacetate precursor method employing microwave combustion synthesis. Powder X-ray diffractometry (XRD) confirmed the formation of the ferrite phase in all samples. IR analysis was done to verify formation of spinel structure. Elemental analysis using EDS confirmed the nanoparticle composition. The crystallite size was calculated from peak widths using the Scherrer formula, yielding a size in the range of 10??25 nm. Transmission electron microscopy was also performed on the samples to testify formation of nanosized crystallites in the sample. Saturation magnetisation (Mr), retentivity (Ms) and coercivity (Hc) measurements were carried out on the samples using standard hysteresis loop tracer equipment. The saturation magnetisation values were found to be in the range of 58.6??63.2 emu/g with very low values for (Mr/Ms). Variation of specific magnetisation with temperature and Curie temperature measurements were carried out using pulse field AC susceptibility measuring equipment. These measurements indicated formation of single domain (SD) material with dependence of Curie temperature on Zn concentration. The density of the samples was found to be high.

R.B. Tangsali; J.S. Budkuley; S.H. Keluskar; G.K. Naik; S.C. Watave

2011-01-01T23:59:59.000Z

349

Table 2 -Lime use and practices on Corn, major producing states, 2001 CO GA IL IN IA KS KY MI MN MO NE NY NC ND OH PA SD TX WI Area  

E-Print Network (OSTI)

Table 2 - Lime use and practices on Corn, major producing states, 2001 CO GA IL IN IA KS KY MI MN.7 Table 2 - Lime use and practices on Corn, major producing states, 2000 CO IL IN IA KS KY MI MN MO NE NY use and practices on Corn, major producing states, 1999 CO IL IN IA KS KY MI MN MO NE NC OH SD TX WI

Kammen, Daniel M.

350

?-? Rearrangement of vinylphosphonium ligand in the coordination sphere of manganese, the crystal and molecular structure of [?5-C5H5(CO)2Mn(?2-PhHc=CHP+Ph3]Cl?  

Science Journals Connector (OSTI)

By the x-ray diffraction analysis method we established the structure of [Cp(CO)2Mn (?-PhHC=CHP+Ph3)]Cl?.

N. E. Kolobova; O. M. Khitrova

1987-09-01T23:59:59.000Z

351

How surface complexes impact boron isotope fractionation: Evidence from Fe and Mn oxides sorption experiments  

Science Journals Connector (OSTI)

Although the pH-dependence of boron isotope fractionation between solution and precipitating minerals has been widely used in Earth Sciences, especially for reconstructing ancient seawater pH, the mechanisms by which boron adsorbs on solids or coprecipitates in minerals are still poorly known. Here we have investigated boron isotopic fractionation during its adsorption on goethite (?-FeOOH) and birnessite (K0.1MnO2.2,0.9H2O) as a function of solution pH at T=25C and I=0.1M. Maximum partition coefficients (Kd) between adsorbed and aqueous boron, equal to 39 and 34 for goethite and birnessite, respectively, are observed at pH=89. B adsorption at the surface of goethite induces its strong pH-dependent isotopic fractionation ranging from ?=?40 (10B enrichment on goethite) at pH10. During adsorption on birnessite at acid and neutral pH, boron isotopic fractionation is lower than during its sorption on goethite (?=?15), decreases (?increases) with increasing pH above pH=8, and reverses at pH>9: 11B enrichment (+23 at pH=10.8) is observed at birnessite surface. Based on combined infrared (DRIFT) spectroscopic analysis and modeling of B speciation at oxidessolution interfaces, the observed isotopic fractionations can be rationalized by the formation of trigonal and tetrahedral boron inner-sphere complexes on goethite surface, and tetrahedral inner-sphere and trigonal outer-sphere and inner-sphere complexes on birnessite surface. B isotopic fractionation is strongly dependent on the structure of surface complexes formed: the high steric strain induced by the formation of trigonal boron bidendate binuclear complexes at goethite surface leads to a much higher isotopic fractionation (isotopically lighter sorbed boron) than that following the formation of tetrahedral bidendate binuclear complexes. Conversely, the formation at birnessite surface of trigonal complexes, having almost the same isotopic composition than aqueous boric acid, accounts for the heavier isotopic composition of birnessite than goethite boron, both at acid and alkaline pH. These results show that, in nature, 11B enrichment is expected in waters in equilibrium with iron or manganese oxides and that this enrichment is a function of pH that changes boron speciation in solution and at solid surfaces. This is typically the case for soil solution in Fe- and Mn-rich environments and in seawater. In addition, the markedly different isotopic fractionation factor, at the same pH, of boron sorbed on goethite and birnessite (at pH=8.2, ? is equal to 0.967 and 0.986 for goethite and birnessite, respectively) may be used to determine past ocean pH values without requiring knowledge of past isotopic composition.

Emmanuel Lemarchand; Jacques Schott; Jrme Gaillardet

2007-01-01T23:59:59.000Z

352

Electronic structure study of the magnetoresistance material CaCu3Mn4O12 by LSDA and LSDA+U  

Science Journals Connector (OSTI)

The electronic structure of the large low-field magnetoresistance material CaCu3Mn4O12 is calculated by using the local-spin-density approximation (LSDA) and on-site Coulomb interaction correction (LSDA+U) to the 3d electronic states of Cu and Mn ions. The results obtained suggest a strong ionic character of this material despite a presence of a partial Mn-O covalence effect. Three Cu ions per formula cell have their respective half-filled orbitals dxy, dyz, and dxz due to their different local crystal environments. Four Mn ions per formula cell have nearly the same oxygen coordinations. As a consequence, the spin-up t2g-like orbitals (dxy,dyz, and dxz) are almost full-filled, while the spin-up eg-like orbitals (d3z2-r2 and dx2-y2) are partially occupied due to a finite pd hybridization. And it is shown that the sublattices of Cu ions and Mn ones are both aligned in ferromagnetic order, while these two sublattices are coupled antiferromagnetically, thus giving a net spin moment of 9 ?B per formula. The LSDA+U calculation yields a semiconducting solution, which is improved upon a half-metallic state given by the LSDA calculation and consistent with an experimental measurement.

Hua Wu, Qing-qi Zheng, and Xin-gao Gong

2000-02-15T23:59:59.000Z

353

K and Mn co-doped BaCd{sub 2}As{sub 2}: A hexagonal structured bulk diluted magnetic semiconductor with large magnetoresistance  

SciTech Connect

A bulk diluted magnetic semiconductor was found in the K and Mn co-doped BaCd{sub 2}As{sub 2} system. Different from recently reported tetragonal ThCr{sub 2}Si{sub 2}-structured II-II-V based (Ba,K)(Zn,Mn){sub 2}As{sub 2}, the Ba{sub 1?y}K{sub y}Cd{sub 2?x}Mn{sub x}As{sub 2} system has a hexagonal CaAl{sub 2}Si{sub 2}-type structure with the Cd{sub 2}As{sub 2} layer forming a honeycomb-like network. The Mn concentration reaches up to x???0.4. Magnetization measurements show that the samples undergo ferromagnetic transitions with Curie temperature up to 16?K. With low coercive field of less than 10?Oe and large magnetoresistance of about ?70%, the hexagonal structured Ba{sub 1?y}K{sub y}Cd{sub 2?x}Mn{sub x}As{sub 2} can be served as a promising candidate for spin manipulations.

Yang, Xiaojun; Zhang, Pan; Jiang, Hao; Luo, Yongkang; Chen, Qian; Feng, Chunmu; Tao, Qian; Cao, Guanghan; Xu, Zhu-An, E-mail: zhuan@zju.edu.cn [Department of Physics and State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027 (China); Li, Yuke; Cao, Chao; Dai, Jianhui [Department of Physics, Hangzhou Normal University, Hangzhou 310036 (China)

2013-12-14T23:59:59.000Z

354

Magneto-optical spectrum and the effective excitonic Zeeman splitting energies of Mn and Co-doped CdSe nanowires  

SciTech Connect

The electronic structure of Mn and Co-doped CdSe nanowires are calculated based on the six-band kp effective-mass theory. Through the calculation, it is found that the splitting energies of the degenerate hole states in Mn-doped CdSe nanowires are larger than that in Co-doped CdSe nanowires when the concentration of these two kinds of magnetic ions is the same. In order to analysis the magneto-optical spectrum of Mn and Co-doped CdSe nanowires, the four lowest electron states and the four highest hole states are sorted when the magnetic field is applied, and the 10 lowest optical transitions between the conduction subbands and the valence subbands at the ? point in Mn and Co-doped CdSe nanowires are shown in the paper, it is found that the order of the optical transitions at the ? point almost do not change although two different kinds of magnetic ions are doped in CdSe nanowires. Finally, the effective excitonic Zeeman splitting energies at the ? point are found to increase almost linearly with the increase of the concentration of the magnetic ions and the magnetic field; meanwhile, the giant positive effective excitonic g factors in Mn and Co-doped CdSe nanowires are predicted based on our theoretical calculation.

Xiong, Wen, E-mail: wenxiong@cqu.edu.cn [Department of Physics, ChongQing University, ChongQing 400044 (China); Chen, Wensuo [Research Institute of China Electronics Technology Group Corporation, ChongQing 400060 (China)

2013-12-21T23:59:59.000Z

355

Effects of strain amplitude and temperature on the damping capacity of an Fe-19Mn alloy with different microstructures  

SciTech Connect

The influences of strain amplitude (10{sup -5}-10{sup -4}) and temperature (25 deg. C-500 deg. C) on the internal friction of a cold-drawn and solution treated Fe-19Mn alloy were investigated. The internal friction was measured using reversal torsion pendulum and multifunction internal friction equipment. The microstructure was observed using scanning electron microscopy. The phase transformation temperatures were determined using differential scanning calorimetry. The results indicated that the internal friction of the solution treated alloy was related to strain amplitude, which could be explained using the movement of Shockley partial dislocations (bowing out and breaking away). But the internal friction of the cold-drawn alloy was independent of strain amplitude because of high density dislocations formed by cold forming. Moreover, when the temperature was changed between 25 deg. C and 500 deg. C, the internal friction of the cold-drawn alloy increased slowly from 25 deg. C to 375 deg. C, and then increased quickly from 375 deg. C to 500 deg. C. However, for the solution treated alloy, there was an internal friction peak at about 210 deg. C in the heating process (from 25 deg. C to 500 deg. C), and there was another internal friction peak at about 150 deg. C in the cooling process. These peaks could be explained using the heat-assisted movement of dislocations. - Research Highlights: {yields}Internal friction of solution treated Fe-19Mn alloy is related to strain amplitude. {yields}Internal friction of cold-drawn Fe-19Mn alloy is independent of strain amplitude. {yields}IF of cold-drawn alloy increases from RT to 500 deg. C. {yields}There is an IF peak of solution treated alloy in heating and cooling process separately. {yields}The results can be explained using the movement of dislocations.

Huang Shuke, E-mail: huangshuke@163.com [Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China); Zhou Danchen; Liu Jianhui [Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China); Teng Jin; Li Ning; Wen Yuhua [School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610065 (China)

2010-11-15T23:59:59.000Z

356

Composition dependence of average and local structure of xLi(Li1/3Mn2/3)O2(1?x)Li(Mn1/3Ni1/3Co1/3)O2 active cathode material for Li ion batteries  

Science Journals Connector (OSTI)

Abstract This study focused on the composition dependence of the crystal structure and cathode performance of xLi(Li1/3Mn2/3)O2(1?x)Li(Mn1/3Ni1/3Co1/3)O2 (0?x?1) prepared by co-precipitation. From charge-discharge tests, it was found that there was large differences in the battery performance between the composition of x=0.2 and x?0.3. For the samples, the average crystal structures were determined by the Rietveld refinement of neutron diffraction patterns. The results indicated that for x=0.2, Li existed at both 2b and 4g sites, whereas for x?0.3, Li was localized at 2b sites and Mn occupied the 4g sites. In order to examine the local crystal structure, pair distribution function (PDF) and extended X-ray absorption fine structure (EXAFS) analyses were carried out. From the PDF analysis, a significant difference was seen in the short-range peaks associated with the transition metal layer for x=0.2, 0.4 and 0.6. The EXAFS results indicated a large difference in the local structure around Mn for x=0.2 and x?0.3. This is thought to be due to ordering of LiMn6 and LiMn5Ni, which is likely to affect cathode performance.

Yasushi Idemoto; Masahiro Inoue; Naoto Kitamura

2014-01-01T23:59:59.000Z

357

Growth and structure of epitaxial Pb{sub 1-x}Mn{sub x}Se(Ga) films  

SciTech Connect

The growth and structure of Pb{sub 1-x}Mn{sub x}Se (Ga) (N{sub Ga} = 0.8 at %) films with thicknesses of 0.3-0.5 {mu}m, grown on single-crystal PbSe{sub 1-x}S{sub x} (100) substrates by molecular-beam epitaxy, have been studied. It is established that films grow in a face-centered cubic lattice with the (100) orientation, reproducing the substrate orientation. The optimal conditions for obtaining photosensitive epitaxial films with perfect crystal structure are determined (W{sub 1/2} = 70-80'').

Nuriyev, I. R., E-mail: mhagiyev@yahoo.com; Gadzhiyev, M. B.; Sadigov, R. M. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2009-03-15T23:59:59.000Z

358

Energy Transfer Dynamics and Dopant Luminescence in Mn-Doped CdS/ZnS Core/Shell Nanocrystals  

E-Print Network (OSTI)

intensity calibration. A 370 nm light emitting diode was used as the excitation light source. . 32 Figure 9 Absorption spectra of Mn-doped CdS/ZnS nanocrystals with (sample 1, solid) and without (sample 2, dashed) Ostwald ripening with the same CdS core... with core size and shell thickness of 3.6 and ~1.8 nm, respectively. The luminescence spectra were taken using a CCD spectrometer (USB2000, Ocean Optics) without intensity calibration using a 370 nm light emitting diode as the excitation light source...

Chen, Hsiang-Yun

2012-11-13T23:59:59.000Z

359

Low-temperature phase transition in nanostructured MnO embedded within the channels of MCM-41-type matrices  

Science Journals Connector (OSTI)

High-resolution x-ray-diffraction experiments of antiferromagnetic MnO nanostructured within the channels of mesoporous MCM-41 matrices reveal an unusual transition from a distorted, trigonal phase to a cubic phase at about 40K, well below the magnetic transition temperature of 120K. The disappearance of the structural distortion is accompanied by an increase of the unit-cell parameter, amplitude of atomic motion, and the appearance of inner stresses. Such behavior drastically differs from the behavior known for the bulk compound.

I. V. Golosovsky; I. Mirebeau; F. Fauth; D. A. Kurdyukov; Yu. A. Kumzerov

2006-08-29T23:59:59.000Z

360

Detector Performance of Ammonium-Sulfide-Passivated CdZnTe and CdMnTe Materials  

SciTech Connect

Dark currents, including those in the surface and bulk, are the leading source of electronic noise in X-ray and gamma detectors, and are responsible for degrading a detector's energy resolution. The detector material itself determines the bulk leakage current; however, the surface leakage current is controllable by depositing appropriate passivation layers. In previous research, we demonstrated the effectiveness of surface passivation in CZT (CdZnTe) and CMT (CdMnTe) materials using ammonium sulfide and ammonium fluoride. In this research, we measured the effect of such passivation on the surface states of these materials, and on the performances of detectors made from them.

Kim, K.H.; Bolotnikov, A.E.; Camarda, G.S.; Marchini, L.; Yang, G.; Hossain, A.; Cui, Y.; Xu, L.; and James, R.B.

2010-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Electrochemical performance of polyaniline coated LiMn{sub 2}O{sub 4} cathode active material for lithium ion batteries  

SciTech Connect

LiMn{sub 2}O{sub 4} compound are synthesized by combustion method using glycine as a fuel at temperature (T), 800C which was coated by a polyaniline. The goal of this procedure is to promote better electronic conductivity of the LiMn{sub 2}O{sub 4} particles in order to improve their electrochemical performance for their application as cathodes in secondary lithium ion batteries. The structures of prepared products have been investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). To investigate the effect of polyaniline coating galvanostatic charge-discharge cycling (148 mA g{sup ?1}) studies are made in the voltage range of 3.5-4.5 V vs. Li at room temperature. Electrochemical performance of the LiMn{sub 2}O{sub 4} was significantly improved by the polaniline coating.

?ahan, Halil, E-mail: halil@erciyes.edu.tr; Dokan, Fatma K?l?c, E-mail: halil@erciyes.edu.tr; Ayd?n, Abdlhamit, E-mail: halil@erciyes.edu.tr; zdemir, Burcu, E-mail: halil@erciyes.edu.tr; zdemir, Nazl?, E-mail: halil@erciyes.edu.tr; Patat, ?aban, E-mail: halil@erciyes.edu.tr [Department of Chemistry, Science Faculty, Erciyes University, Kayseri, 38039 (Turkey)

2013-12-16T23:59:59.000Z

362

Composition and structure of acid leached LiMn{sub 2-y}Ti{sub y}O{sub 4} (0.2<=y<=1.5) spinels  

SciTech Connect

Lithium manganese titanium spinels, LiMn{sub 2-y}Ti{sub y}O{sub 4}, (0.2<=y<=1.5) have been synthesized by solid-state reaction between TiO{sub 2} (anatase), Li{sub 2}CO{sub 3} and MnCO{sub 3}. Li{sup +} was leached from the powdered reaction products by treatment in excess of 0.2 N HCl at 85 deg. C for 6 h, under reflux. The elemental composition of the acidic solution and solid residues of leaching has been determined by complexometric titration, atomic absorption spectroscopy and X-ray fluorescence analysis. Powder X-ray diffraction was used for structural characterization of the crystalline fraction of the solid residues. It has been found that the amount of Li{sup +} leached from LiMn{sub 2-y}Ti{sub y}O{sub 4} decreases monotonically with increasing y in the interval 0.2<=y<=1.0 and abruptly drops to negligibly small values for y>1.0. The content of Mn and Li in the liquid phase and of Mn and Ti in the solid (amorphous plus crystalline) residue, were related to the composition and cation distribution in the pristine compounds. A new formal chemical equation describing the process of leaching and a mechanism of the structural transformation undergone by the initial solids as a result of Li{sup +} removal has been proposed. - Graphical abstract: Schematic representation of the acid leaching of LiMn{sub 2-y}Ti{sub y}O{sub 4} (0.2<=y<=1.0).

Avdeev, Georgi [Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia (Bulgaria); Amarilla, Jose Manuel; Rojo, Jose Maria [Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas (CSIC), Sor Juana Ines de la Cruz no 3, Cantoblanco, 28049 Madrid (Spain); Petrov, Kostadin [Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia (Bulgaria); Rojas, Rosa Maria, E-mail: rmrojas@icmm.csic.e [Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas (CSIC), Sor Juana Ines de la Cruz no 3, Cantoblanco, 28049 Madrid (Spain)

2009-12-15T23:59:59.000Z

363

Influence of solvents on the synthesis and electrochemical properties of Li[Li1/5Ni1/10Co1/5Mn1/2]O2 for the applications in lithium-ion batteries  

Science Journals Connector (OSTI)

The Li[Li1/5Ni1/10Co1/5Mn1/2]O2 was prepared with starting materials having acetate functional group, lithium acetate (CH3COOLi2H2O), nickel acetate ((CH3COO)2Ni4H2O), manganese acetate ((CH3COO)2Mn4H2O)...

K. S. Park; C. H. Song; A. Manuel Stephan; S. K. Jeong

2006-11-01T23:59:59.000Z

364

Temperature dependent electronic structure of Pr{sub 0.67}Sr{sub 0.33}MnO{sub 3} film probed by X-ray absorption near edge structure  

SciTech Connect

The Mn K edge X-ray absorption near edge structures (XANES) of Pr{sub 0.67}Sr{sub 0.33}MnO{sub 3} film (100 nm) on (001) LaAlO{sub 3} substrate was measured at different temperatures to probe the MnO{sub 6} octahedron distortion and corresponding electronic structure. The absorption of high temperature paramagnetic-insulator phase differed from that of the low temperature ferromagnetic-metal phase. The temperature-dependent absorption intensity of Mn K edge XANES was correlated with the relaxation of distorted MnO{sub 6} octahedron, which changed the crystal field acting on the Mn site and the related electronic structure and properties. At low temperature, the splitting of Mn majority e{sub g} orbitals decreased and the density of states above the Fermi level increased in the relaxed MnO{sub 6} octahedron, as reflected by a wider separation between two sub-peaks in the pre-edge XANES spectra.

Zhang, Bangmin [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore); NUSNNI-Nanocore, National University of Singapore, Singapore 117411 (Singapore); Sun, Cheng-Jun, E-mail: cjsun@aps.anl.gov, E-mail: msecgm@nus.edu.sg; Heald, Steve M. [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Chen, Jing-Sheng; Moog Chow, Gan, E-mail: cjsun@aps.anl.gov, E-mail: msecgm@nus.edu.sg [Department of Materials Science and Engineering, National University of Singapore, Singapore 117576 (Singapore); Venkatesan, T. [NUSNNI-Nanocore, National University of Singapore, Singapore 117411 (Singapore); Department of Physics, National University of Singapore, Singapore 117542 (Singapore); Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore)

2014-05-07T23:59:59.000Z

365

Oxygen-Release-Related Thermal Stability and Decomposition Pathways of LixNi0.5Mn1.5O4 Cathode Materials  

Science Journals Connector (OSTI)

(21, 22) Therefore, LixMn2O4 has been regarded as a thermally safer cathode material than layered materials, such as LixCoO2, LixNi0.8Co0.15Al0.05O2, and LixNi1/3Co1/3Mn1/3O2. ... The d- and o-LNMO cathodes were fabricated by slurry-casting 80% active material, 10% of carbon black (Chevron), and 10% of PVDF (Kureha) onto an Al foil current collector. ...

Enyuan Hu; Seong-Min Bak; Jue Liu; Xiqian Yu; Yongning Zhou; Steven N. Ehrlich; Xiao-Qing Yang; Kyung-Wan Nam

2013-12-10T23:59:59.000Z

366

Fischer?Tropsch Synthesis: Influence of Mn on the Carburization Rates and Activities of Fe-Based Catalysts by TPR-EXAFS/XANES and Catalyst Testing  

Science Journals Connector (OSTI)

However, the structure of the catalyst changes as a function of reaction time, with the mixed oxide phase decomposing into iron carbides, magnetite, and MnO, thereby resulting in lower olefin selectivities. ... (7-10) Nevertheless, in examining the Fe K-edge results, although we observed differences in rates of carburization between catalyst samples with and without Mn, we did not detect discernible line shape differences in the XANES spectra between the intermediary iron oxides along the TPR trajectory. ... (35) Epsilon carbide is typically formed at lower temperatures (350 C; cementite is formed at temperatures above 350 C. ...

Mauro C. Ribeiro; Gary Jacobs; Ramana Pendyala; Burtron H. Davis; Donald C. Cronauer; A. Jeremy Kropf; Christopher L. Marshall

2011-02-24T23:59:59.000Z

367

Thermal Stability and Phase Transformation of Electrochemically Charged/Discharged LiMnPO4 Cathode for Li-Ion Battery  

SciTech Connect

Electrochemically active LiMnPO4 nanoplate at lithiated/delithiated state were subjected to thermal stability and phase transformation evaluate for safety as a cathode material for Li-ion battery. The phase transformation and oxygen evolution temperature on the delithiated MnPO4 were characterized using in-situ hot-stage X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), thermogravimetric - differential scanning calorimetry - mass spectroscopy (TGA-DSC-MS), transmission electron microscopy and scanning electron microscopy (SEM) - energy dispersive X-ray analysis (EDAX).

Choi, Daiwon; Xiao, Jie; Choi, Young Joon; Hardy, John S.; Vijayakumar, M.; Bhuvaneswari, M. S.; Liu, Jun; Xu, Wu; Wang, Wei; Yang, Zhenguo; Graff, Gordon L.; Zhang, Jiguang

2011-11-01T23:59:59.000Z

368

LaL2SrL8Mn207BelowTc : Exchange StricthR ECEI VED  

NLE Websites -- All DOE Office Websites (Extended Search)

088-00-105 088-00-105 58916-00-105 9714E3 co C--q 03/64 - 1 Sign Reversal of the MN-0 bond Compressibility r in LaL2SrL8Mn207BelowTc : Exchange StricthR ECEI VED in the Ferromagnetic State JUL Q 7 1997 O S T I D. N. Argyriout§ J. F. Mitchell, J. B. Goodenough * , 0. Chmaissemt S. Short, and J. D. Jorgensen t Science and Technology Center for Superconductivity and Materials Science Division Argonne National Laboratory Argonne, IL 60439 * Center for Materials Science and Engineering, ECT 9.102 University of Texas at Austin Austin, TX 78712-1063 the submitted manuscript has been created by the University of Chicago as Operator of Argonne National ( Argonne") under Contract No. W-31-109-ENG-38 with the U. S. Department of Energy. The U.S. Government retains for itself, and others acting on its behalf, a paid-up, non

369

Two-current spin-dependent conduction in polycrystalline LaMnO{sub 3} produced under oxygen gas flow  

SciTech Connect

We have studied two-current spin-dependent conduction in polycrystalline LaMnO{sub 3} (LMO) produced under the oxygen gas flow (OGF). The polycrystalline La{sub 1?x}Sr{sub x}MnO{sub 3} (LSMO) samples were prepared with x = 0, 0.1, 0.125, 0.15, 0.175, 0.2 by use of a solid-state-reaction method. The LMO sample produced under the OGF showed large electrical conduction due to the self-hole-doping caused by the excess oxygen ions in it. The electrical resistivity and magnetoresistance (MR) of the LSMO samples were measured as a function of temperature (4K-300K). With increasing the temperature, we have observed that the MR ratios of the LSMO samples with x ? 0 have one maximum, while that of LMO sample has two maxima. The temperature at the maximum of the MR ratio corresponds to the magnetic phase transition temperature. The existence of two MR maxima for the LMO sample is considered to imply that the LMO sample has two regions with different doping levels; the one is the crystalline grain region with low doping and the other is the amorphous-like grain-boundary region with high doping.

Kobori, H.; Hoshino, A. [Department of Physics, Konan University, Kobe (Japan); Taniguchi, T. [Department of Physics, Osaka University, Osaka (Japan); Horie, T.; Naitoh, Y.; Shimizu, T. [National Institute of Advanced Industrial Science and Technology, Tsukuba (Japan)

2013-12-04T23:59:59.000Z

370

Field-induced reorientation of the spin helix in MnSi near T{sub c}  

SciTech Connect

The chiral spin fluctuations and the spiral structure of the single crystal MnSi has been studied by small angle polarized neutron scattering near T{sub c}=29 K under applied field. A weak magnetic field applied along one of the <111> axes produces a single domain sample with the helix wave vector along the field. The 90 degree sign reorientation of the spin spiral from the [111] axis to [110] axis is observed in the field range from 130 to 180 mT in the close vicinity to T{sub c}. Further increase of the field above 180 mT restores the original orientation of the helix and leads to the induced ferromagnetic state at 350 mT. This observation clarifies the nature of the structural spin instability found in the H-T phase diagram of MnSi by other techniques. We explain this phenomenon as a result of competition of cubic anisotropy and the spin-wave Bose condensation provoked by the field perpendicular to the helix axis.

Grigoriev, S. V.; Maleyev, S. V.; Okorokov, A. I.; Chetverikov, Yu. O. [Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188300 (Russian Federation); Eckerlebe, H. [GKSS Forschungszentrum, 21502 Geesthacht (Germany)

2006-06-01T23:59:59.000Z

371

arXiv:1101.0723v1[q-bio.MN]4Jan2011 Bistability of an In Vitro Synthetic Autoregulatory Switch  

E-Print Network (OSTI)

synthetic DNA strands and three enzymes, bacteriophage T7 RNA polymerase, Escherichia coli ribonuclease of a synthetic DNA switch regulated by its RNA output acting as a transcription activator. We verifiedarXiv:1101.0723v1[q-bio.MN]4Jan2011 Bistability of an In Vitro Synthetic Autoregulatory Switch

Winfree, Erik

372

Hybrid density functional study of structural, bonding, and electronic properties of the manganite series La1?xCaxMnO3 (x=0,14,1)  

Science Journals Connector (OSTI)

Hybrid-exchange density functional theory calculations are carried out to determine the effects of A-site doping on the electronic and magnetic properties of the manganite series La1?xCaxMnO3. This study focuses on the ground state of an ordered Ca occupancy in a periodic structure. It is shown that the hybrid-exchange functional, Becke three-parameter Lee-Yang-Parr (B3LYP), provides an accurate and consistent description of the electronic structure for LaMnO3, CaMnO3, and La0.75Ca0.25MnO3. We have quantified the relevant structural, magnetic, and electronic energy contributions to the stability of the doped compound. An insight into the exchange coupling mechanism for the low hole density region of the phase diagram, where a polaron (anti-Jahn-Teller) forms, is also provided. This study completes a microscopic description of the lightly doped insulator with an antiferromagnetic-to-ferromagnetic and metal-to-insulator transition.

R. Korotana; G. Mallia; Z. Gercsi; L. Liborio; N. M. Harrison

2014-05-12T23:59:59.000Z

373

The Behaviour of STeel ColumnS in fire Material -Cross-seCtional CapaCity -ColuMn BuCkling  

E-Print Network (OSTI)

The Behaviour of STeel ColumnS in fire Material - Cross-seCtional CapaCity - ColuMn BuIch december 2012 #12;#12;Structural stability and the general behaviour of steel structures can be described during a fire influence the behaviour of steel structures markedly. Significant advances have been made

Giger, Christine

374

Crystal structure refinement of hendricksite, A Zn- and Mn-rich trioctahedral potassium mica: A contribution to the crystal chemistry of zinc-bearing minerals  

Science Journals Connector (OSTI)

The crystal structure of hendricksite, a trioctahedral mica of biotite type, characterized by high Zn2+ and Mn2+ contents has been refined by least square methods. The structural formula is: (K0.89Na0.10Ba0.04)(M...

Dr. J. -L. Robert; Dr. M. Gasprin

1985-01-01T23:59:59.000Z

375

Magnetic orders and spin-flop transitions in the cobalt doped multiferroic $\\rm Mn_{1-x}Co_{x}WO_4$  

SciTech Connect

We present a comprehensive single crystal neutron diffraction investigation of the $\\rm Mn_{1-x}Co_{x}WO_4$ with $0.02\\leq x \\leq0.30$. At lower concentration $x \\leq 0.05$, the system is quickly driven into the multiferroic phase with spin structure forming an elliptical spiral order similar to the parent compound. The reduction of electric polarization is ascribed to the tilting of the spiral plane. For $x\\sim 0.075$, the magnetic structure undergoes a spin flop transition that is characterized by a sudden rotation of the spin helix envelope into the $ac$ plane. This spin structure persists for concentration up to $x=0.15$, where additional competing magnetic orders appear at low temperature. For $0.17 \\leq x \\leq 0.30$, the system experiences another spin flop transition and recovers the low-$x$ spiral spin configuration. A simple commensurate spin structure with $\\vec{q}=(0.5,0,0)$ is found to coexist with the incommensurate spiral order. The complex evolution of magnetic structure in Co doped $\\rm MnWO_4$ contrasts sharply with other transition metal ion doped $\\rm Mn_{1-x}A_xWO_4$ (A=Zn, Mg, Fe) where the chemical substitutions stabilize only one type of magnetic structure. The rich phase diagram of $\\rm Mn_{1-x}Co_{x}WO_4 $ results from the interplay between magnetic frustration and spin anisotropy of the Co ions.

Chi, Songxue [ORNL; Fernandez-Baca, Jaime A [ORNL; Cao, Huibo [ORNL; Liang, K. C. [University of Houston, Houston; Wang, Y. Q. [University of Houston, Houston; Lorenz, Bernd [University of Houston, Houston; Chu, C. W. [University of Houston, Houston

2012-01-01T23:59:59.000Z

376

ccsd00001151 Mon. Not. R. Astron. Soc. 000, 000--000 (0000) Printed 17 February 2004 (MN L A T E X style file v2.2)  

E-Print Network (OSTI)

February 2004 (MN L A T E X style file v2.2) The origin and implications of dark matter anisotropic cosmic, France Typeset 17 February 2004; Received / Accepted ABSTRACT We measure the anisotropy of dark matter web, the picture that comes naturally to mind is one involving these long filamentary structures

377

Surface Modification of LiNi0.5Mn0.3Co0.2O2 Cathode for Improved Battery Performance  

E-Print Network (OSTI)

This thesis details electrical and physical measurements of pulsed laser deposition-applied thin film coatings of Alumina, Ceria, and Yttria-stabilized Zirconia (YSZ) on a LiNi0.5Mn0.3Co0.2O2 (NMC) cathode in a Lithium ion battery. Typical NMC...

Lynch, Thomas

2012-10-19T23:59:59.000Z

378

Rank Name Peak Date Peak Location Bomb Peak Gradient Min Depth (Hr-Dy-Mn-Yr) (Lat, Lon) (Bergeron) (hPa/1000km) (hPa)  

E-Print Network (OSTI)

Rank Name Peak Date Peak Location Bomb Peak Gradient Min Depth (Hr-Dy-Mn-Yr) (Lat, Lon) (Bergeron, and northwest europe (Cambride Univ. Pr.). 1 #12;Figure S1(a): Evolution of 'Daria' (the top ranked storm arrow is approximately 50 m s-1). 2 #12;Figure S1(b): As for Figure S1(a) but for the storm ranked

Caballero, Rodrigo

379

Jet Simulation in a Diesel Engine James Glimm zx , M.N. Kim x , X.-L. Li z , R. Samulyak x , and Z.-L. Xu yz  

E-Print Network (OSTI)

Jet Simulation in a Diesel Engine James Glimm zx , M.N. Kim x , X.-L. Li z , R. Samulyak x , and Z and spray formation in a diesel engine by the Front Tracking method. We model mixed vapor-liquid region?cient, nonpolluting diesel engine. Many parameters such as the nuzzle shape, the velocity and the turbulence

New York at Stoney Brook, State University of

380

A time-resolved optical study of the paramagnetic dielectric-ferromagnetic metal transition in La0.7Ca0.3MnO3  

Science Journals Connector (OSTI)

The relaxation dynamics of charge carriers in an epitaxial La0.7Ca0.3MnO3 film was studied by the light reflection method with a femtosecond time resolution in a wide temperature range. The relaxation of time-res...

1 O. V. Misochko; E. M. Kaidashev

2003-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Preparation and performances of CoMn spinel coating on a ferritic stainless steel interconnect material for solid oxide fuel cell application  

Science Journals Connector (OSTI)

Abstract Ferritic stainless steels have become the candidate materials for interconnects of intermediate temperature solid oxide fuel cell (SOFC). The present issues to be solved urgently for the application of ferritic stainless steel interconnects are their rapid increase in contact resistance and Cr poisoning. In the present study, a chloride electrolyte suspension has been developed to electro-deposit a CoMn alloy on a type 430 stainless steel, followed by heat treatment at 750C in argon and at 800C in air to obtain CoMn spinel coatings. The experimental results indicate that an adhesive and compact CoMn alloy layer can be deposited in the chloride solution. After heat treatment, a complex coating composed of an external MnCo2O4 layer and an inner Cr-rich oxide layer has been formed on 430SS. The coating improves the oxidation resistance of the steel at 800C in air, especially in wet air, and inhibits the outward diffusion of Cr from the Cr-rich scale. Moreover, a low contact resistance has been achieved with the application of the spinel coatings.

H.H. Zhang; C.L. Zeng

2014-01-01T23:59:59.000Z

382

X-ray standing wave study of CdTe/MnTe/CdTe(001) heterointerfaces J. C. Boulliard,a)  

E-Print Network (OSTI)

features of the first stages of growth of ultrathin pseudomorphic MnTe 001 strained layers buried in CdTe on CdTe 001 substrates. Experiments with 004 and 113 reflecting planes show evidence of the presenceTe layers grown in CdTe 001 by molecular beam epitaxy. The results will be compared to high resolution

Boyer, Edmond

383

Strain Effects on the Surface Chemistry of La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3  

E-Print Network (OSTI)

We report on the mechanistic effects of epitaxial strain on the surface chemistry, in particular the segregation of Sr cations on La0.7Sr0.3MnO3 (LSM) model dense thin films. Our results show that the LSM film surfaces are ...

Han, Jeong Woo

384

Electron tunneling characteristics on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] thin-film surfaces at high temperature  

E-Print Network (OSTI)

We report on the electron tunneling characteristics on La0.7Sr0.3MnO3 (LSM) thin-film surfaces up to 580?C in 10[superscript ?3]?mbar oxygen pressure, using scanning tunneling microscopy/spectroscopy (STM/STS). A thresholdlike ...

Katsiev, Khabiboulakh

385

A Novel Method to Improve the Electrochemical Performance of LiMn2O4 Cathode Active Material by CaCO3 Surface Coating  

Science Journals Connector (OSTI)

Spinel LiMn2O4 was synthesized by glycine-nitrate method and coated with CaCO3 in order to enhance the electrochemical performance at room temperature (25C) and 55C. The uncoated and CaCO3-coated LiMn2O4 materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical tests. XRD and SEM results indicated that CaCO3 particles encapsulated the surface of the LiMn2O4 without causing any structural change. The charge-discharge tests showed that the specific discharge capacity fade of pristine electrode at 25 and 55C were 25.5% and 52%, respectively. However, surface modified cathode shows 7.4% and 29.5% loss compared to initial specific discharge capacity at 70th cycle for 25 and 55C, respectively. The improvement of electrochemical performance is attributed to suppression of Mn2+ dissolution into electrolyte via CaCO3 layer.

Halil ?ahan; Hseyin Gktepe; ?aban Patat

2011-01-01T23:59:59.000Z

386

Raman spectrum and ESR of Pr0.5Ca0.4Sr0.1MnO3  

NLE Websites -- All DOE Office Websites (Extended Search)

Raman spectrum and ESR of Pr 0.5 Ca 0.4 Sr 0.1 MnO 3 H.-D. Zhou a , G. Li a , F. Liu a , S.-J. Feng a , Y. Liu a , X.-G. Li a, * , J. Fang b a Structure Research Laboratory,...

387

Temperature and magnetic field dependent optical spectral weight in the cation-deficient colossal-magnetoresistance material La0.936Mn0.982O3  

E-Print Network (OSTI)

with the general arguments, a broad peak has been observed in 1 various Mn-based CMR materials by several groupsTemperature and magnetic field dependent optical spectral weight in the cation-deficient colossal on single-crystal samples as a function of temperature and at zero and 0.5 T magnetic fields

Homes, Christopher C.

388

Mon. Not. R. Astron. Soc. 000, 117 (2011) Printed 30 May 2011 (MN LATEX style file v2.2) The ATLAS3D  

E-Print Network (OSTI)

Mon. Not. R. Astron. Soc. 000, 1­17 (2011) Printed 30 May 2011 (MN LATEX style file v2.2) The ATLAS Physik, PO Box 1312, D-85478 Garching, Germany 14Space Telescope European Coordinating Facility, European observations, and optical integral-field spec- troscopy from the ATLAS3D survey to probe the origin

Bureau, Martin

389

Mon. Not. R. Astron. Soc. 000, 121 (??) Printed 20 May 2011 (MN LATEX style file v2.2) The ATLAS3D  

E-Print Network (OSTI)

Mon. Not. R. Astron. Soc. 000, 1­21 (??) Printed 20 May 2011 (MN LATEX style file v2.2) The ATLAS3D Garching, Germany 8Space Telescope European Coordinating Facility, European Southern Observatory, Karl observations and models conducted within the ATLAS3D project, encompass various mass ratios (from 1:1 to 6

Bureau, Martin

390

Proceedings IEEE Int. Conference on Robotics and Automation (ICRA), Minneapolis, MN, April 1996. What Programmable Vector Fields Can and Cannot Do  

E-Print Network (OSTI)

Proceedings IEEE Int. Conference on Robotics and Automation (ICRA), Minneapolis, MN, April 1996 Facility Cornell University, Ithaca, NY 14853 URL http: www.cs.cornell.edu home karl Micro motion pixels or transversely vibrating macroscopic plates. These new automation designs promise great

391

Photodissociation measurements of bond dissociation energies: D0(Al2-Al), D0(TiO -Mn), and D0(V2 -V)  

E-Print Network (OSTI)

Photodissociation measurements of bond dissociation energies: D0(Al2-Al), D0(TiO -Mn), and D0(V2 -VV was obtained by adding the energy of the 4 A2 state to the measured predissociation threshold. For Ti studies may be used to measure bond lengths and deduce term symbols. As one proceeds to higher energies

Morse, Michael D.

392

Na2WO4/CoMn/SiO2 Catalyst for the Simultaneous Production of Ethylene and Syngas from CH4  

Science Journals Connector (OSTI)

Na2WO4/CoMn/SiO2...catalyst was prepared and used for the simultaneous production of ethylene and syngas from CH4. A CH4 conversion of 38% and a yield of 21% for (C2H4+CO), with a C2H4/CO/H2 ratio of 1/0.7/0.7...

Jingjing Wu; Song Qin; Changwei Hu

2007-10-01T23:59:59.000Z

393

Effect of antiferromagnetic spin correlations on lattice distortion and charge ordering in Pr0.5Ca1.5MnO4  

Science Journals Connector (OSTI)

...correlations on lattice distortion and charge ordering in Pr0.5Ca1.5MnO4 10.1073/pnas.0704303104 Songxue Chi F. Ye Pengcheng Dai J. A. Fernandez-Baca Q. Huang J. W. Lynn E. W. Plummer R. Mathieu Y. Kaneko Y. Tokura *Department of Physics...

Songxue Chi; F. Ye; Pengcheng Dai; J. A. Fernandez-Baca; Q. Huang; J. W. Lynn; E. W. Plummer; R. Mathieu; Y. Kaneko; Y. Tokura

2007-01-01T23:59:59.000Z

394

Electric resistance of La0.67Ca0.33MnO3 films biaxially strained during growth on lattice-mismatched substrates  

Science Journals Connector (OSTI)

We have studied the electric resistance of 20-nm-thick La0.67Ca0.33MnO3 films coherently grown on single crystal substrates with considerable (negative) and almost zero lattice mismatch. The unit cell volume in t...

Yu. A. Boikov; V. A. Danilov

2004-07-01T23:59:59.000Z

395

Electric resistance and magnetoresistance of 30-nm-Thick La0.67Ca0.33MnO3 films elastically compressed in the (110) plane  

Science Journals Connector (OSTI)

We have studied the structure, electric resistance, and magnetoresistance of 30-nm-thick (...0.67Ca0.33MnO3 (LCMO) films grown by laser deposition on (001)-oriented LaAlO3 substrates. The unit cell parameters a a...

Yu. A. Boikov; M. P. Volkov

2008-11-01T23:59:59.000Z

396

IEEE Power and Energy Society General Meeting, July 2010, Minneapolis, MN USA c 2010 IEEE A cutset area concept for phasor monitoring  

E-Print Network (OSTI)

IEEE Power and Energy Society General Meeting, July 2010, Minneapolis, MN USA c 2010 IEEE A cutset Madison WI 53706 USA dobson@engr.wisc.edu Manu Parashar, Member IEEE Electric Power Group 201 S. Lake Ave, Suite 400 Pasadena CA 91101 USA parashar@electricpowergroup.com Abstract--We show how to combine

Dobson, Ian

397

Conversion of CH4 into H2 at 300 C using Pd/MnO2 catalyst made with an effect of water oxidation  

SciTech Connect

A novel electricity-free deposition of palladium on the surface of manganese dioxide, which has a crystal structure of ramsdellite, was studied. Using the Pd deposition, a nano-particle of Pd/MnO2 was prepared, and it was used for a catalytic performance for reforming methane into hydrogen at 300 C.

Koyanaka, Hideki [Forward Science Laboratory Ltd, Oita, Japan] [Forward Science Laboratory Ltd, Oita, Japan; Takeuchi, K [Tokyo University of Science, Oshamanbe Hokkaido, Japan] [Tokyo University of Science, Oshamanbe Hokkaido, Japan; Kolesnikov, Alexander I [ORNL] [ORNL

2014-01-01T23:59:59.000Z

398

Improvements in electrical and dielectric properties of substituted multiferroic LaMnO{sub 3} based nanostructures synthesized by co-precipitation method  

SciTech Connect

Graphical abstract: Display Omitted Highlights: ? Simultaneous double ion substitutions philosophy is introduced in LaMnO{sub 3}. ? La{sub 1?x}Gd{sub x}Mn{sub 1?y}Cr{sub y}O{sub 3} nanoparticles are not reported previously. ? La{sub 1?x}Gd{sub x}Mn{sub 1?y}Cr{sub y}O{sub 3} nanoparticles are synthesized by co-precipitation method. ? The 12 fold increase in resistivity of LaMnO{sub 3} nanostructures is observed. -- Abstract: A series of La{sub 1?x}Gd{sub x}Mn{sub 1?y}Cr{sub y}O{sub 3} nanoparticles (where x, y = 0, 0.25, 0.50, 0.75 and 1.0) has been synthesized by the chemical co-precipitation method, involving double ion substitution philosophy. The nanoparticles were characterized by thermo gravimetric analysis (TGA), X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, vibrating sample magnetometer (VSM), DC electrical resistivity and dielectric measurements. The XRD and FTIR analysis confirmed the single orthorhombic phase and the crystallite size were found in the range of 1634 nm. DC resistivity exhibited very interesting behavior which increased from 1.41 10{sup 8} to 16.35 0.2 10{sup 8} ? cm upon complete double ions replacement of La and Mn with Gd and Cr, respectively. This very high resistivity variation upon substitution definitely would open new avenues for applications of these materials in microwave devices and other related areas. The dielectric properties of these nanoparticles were also studied at room temperature in the range of 6 kHz to 5 MHz and the maximum dielectric behavior (?? = 2.86 10{sup 3}, tan ? = 5.41, ?? = 15.5 10{sup 3}) was exhibited by La{sub 0.75}Gd{sub 0.25}Mn{sub 0.75}Cr{sub 0.25}O{sub 3} at 6 kHz. Hysteresis loops measurements showed that the synthesized nanomaterials are paramagnetic in nature at room temperature.

Mahmood, Azhar [Chemistry Department, Baghdad-ul-Jaded Campus, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan)] [Chemistry Department, Baghdad-ul-Jaded Campus, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan); Warsi, Muhammad Farooq, E-mail: Farooq.warsi@iub.edu.pk [Chemistry Department, Baghdad-ul-Jaded Campus, The Islamia University of Bahawalpur, Bahawalpur 63100 (Pakistan); Ashiq, Muhammad Naeem [Department of Chemistry, Bahauddin Zakaryia University of Multan-60000 (Pakistan)] [Department of Chemistry, Bahauddin Zakaryia University of Multan-60000 (Pakistan); Sher, Muhammad [Chemistry Department, The University of Sargodha, Sargodha 40100 (Pakistan)] [Chemistry Department, The University of Sargodha, Sargodha 40100 (Pakistan)

2012-12-15T23:59:59.000Z

399

Liquid crystalline phase synthesis of nanoporous MnO{sub 2} thin film arrays as an electrode material for electrochemical capacitors  

SciTech Connect

Graphical abstract: Three-dimensional (3D) MnO{sub 2} thin film arrays with nanoporous structure is electrodeposited on Ti foil from hexagonal lyotropic liquid crystalline phase. Low-angle X-ray diffraction (XRD), wide-angle XRD, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) are employed to study the morphology and the structure of the as-synthesized MnO{sub 2} materials. Galvanostatic charge/discharge measurements show the nanoporous, 3D electrode material exhibits excellent capacitive performance between the potential range of ?0.1 to 0.9 V, and a maximum specific capacitance as high as 462 F g{sup ?1} are achieved in 0.5 M Na{sub 2}SO{sub 4} solution at a charge/discharge current density of 4 A g{sup ?1}. Highlights: ? 3D MnO{sub 2} thin film arrays with nanoporous structure is fabricated for the first time. ? A maximum specific capacitance as high as 462 F g{sup ?1} is obtained. ? The 3D and nanoporous superarchitecture facilitate electrolyte penetration. -- Abstract: Three-dimensional (3D) MnO{sub 2} thin film arrays with nanoporous structure is electrodeposited on Ti foil from hexagonal lyotropic liquid crystalline phase. Low-angle X-ray diffraction (XRD), wide-angle XRD, field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) are employed to study the morphology and the structure of the as-synthesized MnO{sub 2} materials. Galvanostatic charge/discharge measurements show the nanoporous, 3D electrode material exhibits excellent capacitive performance between the potential range of ?0.1 to 0.9 V, and a maximum specific capacitance as high as 462 F g{sup ?1} are achieved in 0.5 M Na{sub 2}SO{sub 4} solution at a charge/discharge current density of 4 A g{sup ?1}.

Yang, Guangwu, E-mail: yanggw@upc.edu.cn [College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China) [College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China); Key Laboratory of New Energy Physics and Materials Science in Universities of Shandong, China University of Petroleum, Qingdao, Shandong 266555 (China); Wang, Baoli [School of Geosciences, China University of Petroleum, Qingdao, Shandong 266555 (China)] [School of Geosciences, China University of Petroleum, Qingdao, Shandong 266555 (China); Guo, Wenyue, E-mail: wyguo@upc.edu.cn [College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China) [College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China); Key Laboratory of New Energy Physics and Materials Science in Universities of Shandong, China University of Petroleum, Qingdao, Shandong 266555 (China); Bu, Zhongheng; Miao, Chengcheng [College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China)] [College of Science, China University of Petroleum, Qingdao, Shandong 266555 (China); Xue, Tong; Li, Hulin [College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (China)] [College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (China)

2012-11-15T23:59:59.000Z

400

Electronic and optical properties of ScN and (Sc,Mn)N thin films deposited by reactive DC-magnetron sputtering  

SciTech Connect

Scandium nitride (ScN) is a rocksalt semiconductor that has attracted significant attention from various researchers for a diverse range of applications. Motivated by the prospect of using its interesting electronic structure for optoelectronic and dilute magnetic semiconductor applications, we present detailed studies of the electronic transport and optical properties of ScN and its alloys with manganese nitride (MnN). Our results suggest (a) dilute manganese doping in ScN compensates for the high n-type carrier concentrations arising due to oxygen impurities and (b) an n-type to p-type carrier type transition occurs at a composition between 5.8% and 11% Mn on Sc sites. In terms of its optical properties, our analysis clearly indicates direct and indirect bandgap absorption edges of ScN located at 2.04 eV and 1.18 eV, respectively. In addition to the direct gap absorption edge, (Sc,Mn)N samples also show Mn-defect induced electronic absorption. Photoluminescence measurements at room temperature from ScN films exhibit a yellowish-green emission corresponding to direct gap radiative recombination. Direct gap recombination is not expected given the smaller indirect gap. A possible role of high excitation intensities in suppressing relaxation and recombination across the indirect bandgap is suspected. Raman spectroscopic and ellipsometric characterization of the dielectric permittivities of ScN and (Sc,Mn)N are also presented to assist in understanding the potential of ScN for optoelectronic applications.

Saha, Bivas [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States) [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Naik, Gururaj; Boltasseva, Alexandra [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States) [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Drachev, Vladimir P. [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States) [Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Department of Physics, University of North Texas, Denton, Texas 76203 (United States); Marinero, Ernesto E. [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)] [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Sands, Timothy D. [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States) [School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907 (United States); Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)

2013-08-14T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


401

An electron paramagnetic resonance spectroscopy investigation of the retention mechanisms of Mn and Cu in the nanopore channels of three zeolite minerals  

SciTech Connect

The adsorption mechanisms of divalent cations in zeolite nanopore channels can vary as a function of their pore dimensions. The nanopore inner-sphere enhancement (NISE) theory predicts that ions may dehydrate inside small nanopore channels in order to adsorb more closely to the mineral surface if the nanopore channel is sufficiently small. The results of an electron paramagnetic resonance (EPR) spectroscopy study of Mn and Cu adsorption on the zeolite minerals zeolite Y (large nanopores), ZSM-5 (intermediate nanopores), and mordenite (small nanopores) are presented. The Cu and Mn cations both adsorbed via an outer-sphere mechanism on zeolite Y based on the similarity between the adsorbed spectra and the aqueous spectra. Conversely, Mn and Cu adsorbed via an inner-sphere mechanism on mordenite based on spectrum asymmetry and peak broadening of the adsorbed spectra. However, Mn adsorbed via an outer-sphere mechanism on ZSM-5, whereas Cu adsorbed on ZSM-5 shows a high degree of surface interaction that indicates that it is adsorbed closer to the mineral surface. Evidence of dehydration and immobility was more readily evident in the spectrum of mordenite than ZSM-5, indicating that Cu was not as close to the surface on ZSM-5 as it was when adsorbed on mordenite. Divalent Mn cations are strongly hydrated and are held strongly only in zeolites with small nanopore channels. Divalent Cu cations are also strongly hydrated, but can dehydrate more easily, presumably due to the Jahn-Teller effect, and are held strongly in zeolites with medium sized nanopore channels or smaller.

Ferreira, Daniel R.; Schulthess, Cristian P.; Amonette, James E.; Walter, Eric D.

2012-12-01T23:59:59.000Z

402

Growth and structure of photosensitive Pb{sub 1-x}Mn{sub x}Te(Ga) epitaxial films  

SciTech Connect

The growth and structure of (1-1.5)-{mu}m-thick Pb{sub 1-x}Mn{sub x}Te(Ga)(x = 0.06) films with 0.4-0.9 at % of gallium, grown on BaF{sub 2}(111) and Pb{sub 1-x}Sn{sub x}Te (x = 0.2) (100) substrates by molecular beam epitaxy, have been investigated. It is established that the films are crystallized into an fcc structure, and their growth planes are (111) and (100), according to the substrate orientation. The optimal conditions for obtaining high-resistivity photosensitive p-and n-type films with a perfect crystal structure (W{sub 1/2} = 80''-100'') have been determined.

Nuriev, I. R.; Sadygov, R. M.; Nazarov, A. M., E-mail: afinnazarov@yahoo.com [Azerbaijan National Academy of Sciences, Institute of Physics (Azerbaijan)

2008-05-15T23:59:59.000Z

403

Symmetrical interfacial reconstruction and magnetism in La{sub 0.7}Ca{sub 0.3}MnO{sub 3}/YBa{sub 2}Cu{sub 3}O{sub 7}/La{sub 0.7}Ca{sub 0.3}MnO{sub 3} heterostructures.  

SciTech Connect

We have analyzed the interface structure and composition of La{sub 0.7}Ca{sub 0.3}MnO{sub 3}/YBa{sub 2}Cu{sub 3}O{sub 7}/La{sub 0.7}Ca{sub 0.3}MnO{sub 3} trilayers by combined polarized neutron reflectometry, aberration-corrected microscopy, and atomic column resolution electron-energy-loss spectroscopy and x-ray absorption with polarization analysis. We find the same stacking sequence at both top and bottom cuprate interfaces. X-ray magnetic circular dichroism experiments show that both cuprate interfaces are magnetic with a magnetic moment induced in Cu atoms as expected from symmetric Mn-O-Cu superexchange paths. These results supply a solid footing for the applicability of recent theories explaining the interplay between magnetism and superconductivity in this system in terms of the induced Cu spin polarization at both interfaces.

Visani, C.; Tornos, J.; Nemes, N. M.; Rocci, M.; Leon, C.; Santamaria, J.; te Velthuis, S. G. E.; Liu, Y.; Hoffmann, A.; Freeland, J. W.; Garcia-Hernandez, M.; Fitzsimmons, M. R.; Kirby, B. J.; Varela, M.; Pennycock, S. J. (Materials Science Division); ( XSD); (Univ. Complutense de Madrid); (Inst. de Ciencia de Materiales de Madrid); (LANL); (ORNL)

2011-01-01T23:59:59.000Z

404

MnII (TCNE)3/2(I3)1/2 - A 3-D Network-structured Organic-based Magnet and Comparison to a 2-D Analog  

SciTech Connect

Mn{sup II}(TCNE){sub 3/2}(I{sub 3}){sub 1/2} and Mn{sup II}(TCNE)[C{sub 4}(CN){sub 8}]{sub 1/2} [tetracyanoethylene (TCNE)] are organic-based magnets with 3D and 2D extended network structures with vastly different magnetic behavior. They have similar ferrimagnetic coupled layers of Mn{sup II}(TCNE){sup {lg_bullet}-} with different interlayer couplings, which lead, respectively, to net ferrimagnetic (T{sub c} = 171 K) and antiferromagnetic (T{sub c} = 68 K) order.

Stone, K.; Stephens, P; McConnell, A; Shurdha, E; Pokhodnya, K; Miller, J

2010-01-01T23:59:59.000Z

405

Study of C-coated LiFe{sub 0.33}Mn{sub 0.67}PO{sub 4} as positive electrode material for Li-ion batteries  

SciTech Connect

Commercial C-LiFe{sub 0.33}Mn{sub 0.67}PO{sub 4} positive electrode material has been investigated by {sup 57}Fe Moessbauer Spectroscopy (MS), X-ray Photoelectron Spectroscopy (XPS) and X-ray Absorption Spectroscopy (XAS). The combined use of these experimental techniques provides a better understanding of the electrochemical reaction involved during cycling. {sup 57}Fe MS is very efficient to directly follow oxidation state of Fe in the electrode, and gives surprisingly indirect information on the oxidation state of Mn as observed by XAS and XPS. The electrochemical mechanism is proposed based from in situ and operando investigations using both MS and XAS, and is consistent with XPS surface studies. XPS analysis of the electrodes at the end of charge (4.4 V) reveals enhanced electrode/electrolyte interface reactivity at this high potential. Aging of C-LiFe{sub 0.33}Mn{sub 0.67}PO{sub 4}/Li cells after 50 cycles at 60 Degree-Sign C indicates a rather good electrochemical behavior (low capacity fading) of the electrode material. Both {sup 57}Fe MS and XPS (Mn 2p and Fe 2p) clearly show no modification on Fe and Mn oxidation state compared to fresh electrode confirming the good electrochemical performances. - Graphical abstrct: Quantitative evaluation of the Fe{sup 3+} and Mn{sup 3+} content during the first charge/discharge cycle obtained from K-edge XANES spectra of C-LiFe{sub 0.33}Mn{sub 0.67}PO{sub 4} recorded upon cell operation at RT with C/10 rate. During the charge co-existence of Fe and Mn oxidation is observed between points 2 and 4 of the potential curve. At the end of the charge the cut-off voltage limits the oxidation at about 93%. Highlights: Black-Right-Pointing-Pointer C-LiFe{sub 0.33}Mn{sub 0.67}PO{sub 4} electrode material upon cycling vs. metallic lithium. Black-Right-Pointing-Pointer {sup 57}Fe Moessbauer spectroscopy is a (in)direct probe for Fe(Mn) oxidation state. Black-Right-Pointing-Pointer Both K-Fe and K-Mn edges XAS show a simultaneous oxidation of Fe{sup 2+} and Mn{sup 2+} in a small range of compositions. Black-Right-Pointing-Pointer Surface analysis from XPS allows reveals slight differences at the surface of the electrode with respect to the bulk.

Perea, A. [Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1 Agregats, Interfaces et Materiaux pour l'Energie CC 1502, Place Eugene Bataillon, 34095 Montpellier, Cedex 5 (France); Castro, L. [IPREM-ECP, Universite de Pau, Helioparc, 2 av. Pierre Angot, 64053 Pau, Cedex 9 (France); Aldon, L., E-mail: laurent.aldon@um2.fr [Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1 Agregats, Interfaces et Materiaux pour l'Energie CC 1502, Place Eugene Bataillon, 34095 Montpellier, Cedex 5 (France); Stievano, L. [Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1 Agregats, Interfaces et Materiaux pour l'Energie CC 1502, Place Eugene Bataillon, 34095 Montpellier, Cedex 5 (France); Dedryvere, R.; Gonbeau, D. [IPREM-ECP, Universite de Pau, Helioparc, 2 av. Pierre Angot, 64053 Pau, Cedex 9 (France); Tran, N.; Nuspl, G. [Sued-Chemie AG, Ostenriederstr. 15, D-85368 Moosburg (Germany); Breger, J.; Tessier, C. [SAFT, 111-113 bd. Alfred Daney, 33074 Bordeaux, Cedex (France)

2012-08-15T23:59:59.000Z

406

Enhancement of exchange bias and training effect in ion-beam sputtered Fe{sub 46}Mn{sub 54}/Ni{sub 81}Fe{sub 19} bilayers  

SciTech Connect

We present a remarkable enhancement by 300% of the exchange-bias field at room temperature, without affecting the coercivity value, via optimum magnetic annealing (250?C/3 kOe) in ion-beam sputtered FeMn(30?nm)/NiFe(10?nm) bilayers. This specific behavior has been attributed to a higher degree of ?-FeMn(111) orientation that offers more interfacial FeMn moments to get pinned with the moments of the adjacent NiFe layer. Unlike the absence of training effect at room temperature, a pronounced training effect and an accompanying magnetization reversal asymmetry are evidenced upon field cooling below 50?K due to the presence of biaxial exchange induced anisotropy across the interdiffused FeMn/NiFe interface. The present findings not only have technological significance but also are of relevance to the understanding of interfacial spin disorder and frustration in these exchange-biased systems.

Fulara, Himanshu; Chaudhary, Sujeet, E-mail: sujeetc@physics.iitd.ac.in; Kashyap, Subhash C. [Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India); Granville, Simon [Callaghan Innovation, PO Box 31310, Lower Hutt 5040 (New Zealand); The MacDiarmid Institute for Advanced Materials and Nanotechnology, Lower Hutt (New Zealand)

2014-01-28T23:59:59.000Z

407

Microwave Plasma Chemical Vapor Deposition of Carbon Coatings on LiNi1/3Co1/3Mn1/3O2 for Li-Ion Battery Composite Cathodes  

E-Print Network (OSTI)

1/3 Mn 1/3 O 2 cathode active material powders for lithium-conductivity of cathode active materials can limit the powergraphitic coatings on cathode active material powders and

Doeff, M.M.

2012-01-01T23:59:59.000Z

408

Effect of Sulfate Electrolyte Additives on LiNi1/3Mn1/3Co1/3O2/graphite Pouch Cell Lifetime: Correlation between XPS Surface Studies and Electrochemical Test Results.  

Science Journals Connector (OSTI)

Effect of Sulfate Electrolyte Additives on LiNi1/3Mn1/3Co1/3O2/graphite Pouch Cell Lifetime: Correlation between XPS Surface Studies and Electrochemical Test Results. ...

Lnac Madec; Jian Xia; Remi Petibon; Kathlyne J Nelson; Jon-Paul Sun; Ian G. Hill; Jeff R Dahn

2014-11-24T23:59:59.000Z

409

Synthesis and catalytic application of nanofibrous La{sub 0.9}A{sub 0.1}MnO{sub 3} (A = Ca, Cu, Ag) with macroscopic shapes  

SciTech Connect

Graphical abstract: Fabrication of nanofibrous La{sub 0.9}A{sub 0.1}MnO{sub 3} (A = Ca, Cu, Ag) perovskite-type oxides with macroscopic shapes was successfully obtained using carbon nanofibers (CNFs) as templates. Furthermore, their application for the combustion of carbon black (CB), which is a model of particulate matter exhausted from diesel engines, was demonstrated. - Highlights: Nanofibrous La{sub 0.9}A{sub 0.1}MnO{sub 3} with macroscopic shapes was successfully obtained. CNFs template method used here is facile, effective and reproducible. The obtained materials show superior catalytic activity in soot combustion. The catalytic order is La{sub 0.9}Ag{sub 0.1}MnO{sub 3} > La{sub 0.9}Cu{sub 0.1}MnO{sub 3} > La{sub 0.9}Ca{sub 0.1}MnO{sub 3}. - Abstract: Fabrication of nanofibrous La{sub 0.9}A{sub 0.1}MnO{sub 3} (A = Ca, Cu, Ag) perovskite-type oxides with macroscopic shapes can be successfully obtained by using CNFs as templates. Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) analysis confirmed the template effect and formation of nanofibrous perovskite-type oxides on macroscopic silica fiber. It turned out that it is reliable to control the desired single-phase La{sub 0.9}A{sub 0.1}MnO{sub 3} (A = Ca, Cu, Ag) perovskite-type oxides formation by tuning the corresponding metal ratio during preparation process. Furthermore, it showed that the as-prepared nanofibrous La{sub 0.9}A{sub 0.1}MnO{sub 3} (A = Ca, Cu, Ag) perovskite-type oxides can greatly decrease the combustion temperature of nanosized carbon black particles, and follows the order of La{sub 0.9}Ag{sub 0.1}MnO{sub 3} > La{sub 0.9}Cu{sub 0.1}MnO{sub 3} > La{sub 0.9}Ca{sub 0.1}MnO{sub 3}, indicating their high potential application prospects in diesel soot particles treatment.

Wu, Qiang, E-mail: qiangwu@shiep.edu.cn; Zhao, Li; Wu, Jiang; Yao, Weifeng

2013-10-15T23:59:59.000Z

410

Li0.93[Li0.21Co0.28Mn0.51]O2 nanoparticles for lithium battery cathode material made by cationic exchange from K-birnessite  

E-Print Network (OSTI)

Li0.93[Li0.21Co0.28Mn0.51]O2 nanoparticles for lithium battery cathode material made by cationic arising from the Jahn­Teller active Mn3+ ion [6,7]. These cathode mate- rials transformed to a spinel in lithium concentration. The as-prepared cathode particle has plate-like hexagonal morphology with a size

Cho, Jaephil

411

Enhanced rate capability of LiMn0.9Mg0.1PO4 nanoplates by reduced graphene oxide/carbon double coating for Li-ion batteries  

E-Print Network (OSTI)

March 2014 Available online 12 March 2014 Keywords: Li-ion battery LiMnPO4 Reduced graphene oxide ChargeEnhanced rate capability of LiMn0.9Mg0.1PO4 nanoplates by reduced graphene oxide/carbon double coating for Li-ion batteries Sungun Wi a , Jaewon Kim a , Seunghoon Nam a , Joonhyeon Kang a , Sangheon

Park, Byungwoo

412

MN Center for Renewable Energy: Cellulosic Ethanol, Optimization of Bio-fuels in Internal Combustion Engines, & Course Development for Technicians in These Areas  

SciTech Connect

This final report for Grant #DE-FG02-06ER64241, MN Center for Renewable Energy, will address the shared institutional work done by Minnesota State University, Mankato and Minnesota West Community and Technical College during the time period of July 1, 2006 to December 30, 2008. There was a no-cost extension request approved for the purpose of finalizing some of the work. The grant objectives broadly stated were to 1) develop educational curriculum to train technicians in wind and ethanol renewable energy, 2) determine the value of cattails as a biomass crop for production of cellulosic ethanol, and 3) research in Optimization of Bio-Fuels in Internal Combustion Engines. The funding for the MN Center for Renewable Energy was spent on specific projects related to the work of the Center.

John Frey

2009-02-22T23:59:59.000Z

413

Participation of Glutamate-354 of the CP43 Polypeptide in the Ligation of Mn and the Binding of Substrate Water in Photosystem II  

SciTech Connect

In the current X-ray crystallographic structural models of photosystem II, Glu354 of the CP43 polypeptide is the only amino acid ligand of the oxygen-evolving Mn4Ca cluster that is not provided by the D1 polypeptide. To further explore the influence of this structurally unique residue on the properties of the Mn4Ca cluster, the CP43-E354Q mutant of the cyanobacterium Synechocystis sp. PCC 6803 was characterized with a variety of biophysical and spectroscopic methods, including polarography, EPR, X-ray Absorption, FTIR, and mass spectrometry. The kinetics of oxygen release in the mutant were essentially unchanged from those in wild-type. In addition, the oxygen flash-yields exhibited normal period-four oscillations having normal S state parameters, although the yields were lower, correlating with the mutant?s lower steady-state rate (approx. 20percent compared to wild-type). Experiments conducted with H218O showed that the fast and slow phases of substrate water exchange in CP43-E354Q thylakoid membranes were accelerated 8.5- and 1.8-fold, respectively, in the S3 state compared to wild-type. Purified oxygen-evolving CP43-E354Q PSII core complexes exhibited a slightly altered S1 state Mn-EXAFS spectrum, a slightly altered S2 state multiline EPR signal, a substantially altered S2-minus-S1 FTIR difference spectrum, and an unusually long lifetime for the S2 state (> 10 hours) in a substantial fraction of reaction centers. In contrast, the S2 state Mn-EXAFS spectrum was nearly indistinguishable from that of wild-type. The S2-minus-S1 FTIR difference spectrum showed alterations throughout the amide and carboxylate stretching regions. Global labeling with 15N and specific labeling with L-[1-13C]alanine revealed that the mutation perturbs both amide II and carboxylate stretching modes and shifts the symmetric carboxylate stretching modes of the ?-COO? group of D1-Ala344 (the C-terminus of the D1 polypeptide) to higher frequencies by 3 ? 4 cm-1 in both the S1 and S2 states. The EPR and FTIR data implied that 76 -82 percent of CP43-E354Q PSII centers can achieve the S2 state and that most of these can achieve the S3 state, but no evidence for advancement beyond the S3 state was observed in the FTIR data, at least not in a majority of PSII centers. Although the X-ray absorption and EPR data showed that the CP43-E354Q mutation only subtly perturbs the structure and spin state of the Mn4Ca cluster in the S2 state, the FTIR and H218O exchange data show that the mutation strongly influences other properties of the Mn4Ca cluster, altering the response of numerous carboxylate and amide groups to the increased positive charge that develops on the cluster during the S1 to S2 transition and weakening the binding of both substrate water molecules (or water derived ligands), especially the one that exchanges rapidly in the S3 state. The FTIR data provide evidence that CP43-Glu354 coordinates to the Mn4Ca cluster in the S1 state as a bridging ligand between two metal ions, but provide no compelling evidence that this residue changes its coordination mode during the S1 to S2 transition. The H218O exchange data provide evidence that CP43-Glu354 interacts with the Mn ion that ligates the substrate water molecule (or water-derived ligand) that is in rapid exchange in the S3 state.

Service, Rachel; Yano, Junko; McConnell, Iain; Hwang, Hong Jin; Niks, Dimitri; Hille, Russ; Wydrzynski, Tom; Burnap, Robert; Hillier, Warwick; Debus, Richard

2010-09-30T23:59:59.000Z

414

Perpendicular magnetic anisotropy of Mn{sub 4}N films on MgO(001) and SrTiO{sub 3}(001) substrates  

SciTech Connect

We grew Mn{sub 4}N epitaxial thin films capped with Au layers on MgO(001) and SrTiO{sub 3}(001) substrates by molecular beam epitaxy. Perpendicular magnetic anisotropy (PMA) was confirmed in all the samples at room temperature from the magnetization versus magnetic field curves using superconducting quantum interference device magnetometer. From the ?-2? x-ray diffraction (XRD) and ?-2?{sub ?} XRD patterns, the ratios of perpendicular lattice constant c to in-plane lattice constant a, c/a, were found to be about 0.99 for all the samples. These results imply that PMA is attributed to the in-plane tensile strain in the Mn{sub 4}N films.

Yasutomi, Yoko; Ito, Keita; Sanai, Tatsunori; Toko, Kaoru; Suemasu, Takashi, E-mail: suemasu@bk.tsukuba.ac.jp [Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)

2014-05-07T23:59:59.000Z

415

Left-handed properties of manganite-perovskites La{sub 1-x}Sr{sub x}MnO{sub 3} at various dopant concentrations  

SciTech Connect

The experimental study of Double Negative (DNG) state of electromagnetic wave propagating in lanthanum manganite-perovskites doped with strontium La{sub 1-x}Sr{sub x}MnO{sub 3} is provided firstly below individual Curie temperatures (in ferromagnetic metal state (FM) for La{sub 1-x}Sr{sub x}MnO{sub 3}). Various dopant concentrations are considered for ceramic specimens: x = 0.15;??0.225;??0.3;??0.45;??0.6. It is shown that dependence of the DNG-peak intensity on dopant concentration is sharply non-monotone with maximum at the dopant concentrations x = 0.225 0.3. This behaviour follows the change of Curie temperature with increase of dopant concentration in such substances. The obtained dependence of DNG peak intensity supports the opinion concerning the role of disorder in highly doped manganite-perovskite magnetic ceramics under study.

Belozorov, D. P. [Institute for Theoretical Physics NSC Kharkov Institute of Physics and Technology NAS of Ukraine, 1 Akademicheskaja St., Kharkov, 61108 (Ukraine)] [Institute for Theoretical Physics NSC Kharkov Institute of Physics and Technology NAS of Ukraine, 1 Akademicheskaja St., Kharkov, 61108 (Ukraine); Girich, A. A.; Tarapov, S. I., E-mail: tarapov@ire.kharkov.ua [Institute of Radiophysics and Electronics NAS of Ukraine, 12 Proskura St., Kharkov, 61085 (Ukraine); Pogorily, A. M.; Tovstolytkin, A. I. [Institute of Magnetism, 36-b Vernadsky Blvd., Kyiv 03142 (Ukraine)] [Institute of Magnetism, 36-b Vernadsky Blvd., Kyiv 03142 (Ukraine); Belous, A. G.; Solopan, S. A. [Institute of General and Inorganic Chemistry, 32/34 Palladina Blvd., Kyiv 03142 (Ukraine)] [Institute of General and Inorganic Chemistry, 32/34 Palladina Blvd., Kyiv 03142 (Ukraine)

2014-03-15T23:59:59.000Z

416

Single crystalline La0.5Sr0.5MnO3 microcubes as cathode of solid oxide fuel cell  

SciTech Connect

The efficiency of solid oxide fuel cells (SOFCs) is heavily dependent on the electrocatalytic activity of the cathode toward the oxygen reduction reaction (ORR). In order to achieve better cathode performance, single crystalline La0.5Sr0.5MnO3 (LSM) microcubes with the {200} facets have been synthesized by the hydrothermal method. It is found that the LSM microcubes exhibit lower polarization resistance than the conventional polycrystalline La0.8Sr0.2MnO3 powder in air from 700 #2;C to 900 #2;C. The ORR activation energy of the LSM microcubes is lower than that of the conventional powder. The ORR kinetics for the microcubes is limited by the charge transfer step while that for the conventional powder is dominated by the oxygen adsorption and dissociation on the cathode surface.

Mingjia Zhi; Guangwen Zhou; Zhanglian Hong; Jin Wang; Randall Gemmen; Kirk Gerdes; Ayyakkannu Manivannan; Dongling Mae; Nianqiang Wu

2010-09-13T23:59:59.000Z

417

Combustion Synthesis of Nanoparticulate LiMgxMn1-xPO4 (x=0, 0.1, 0.2) Carbon Composites  

SciTech Connect

A combustion synthesis technique was used to prepare nanoparticulate LiMgxMn1-xPO4 (x=0, 0.1,0.2)/carbon composites. Powders consisted of carbon-coated particles about 30 nm in diameter, which were partly agglomerated into larger secondary particles. The utilization of the active materials in lithium cells depended most strongly upon the post-treatment and the Mg content, and was not influenced by the amount of carbon. Best results were achieved with a hydrothermally treated LiMg0.2Mn0.8PO4/C composite, which exhibited close to 50percent utilization of the theoretical capacity at a C/2 discharge rate.

Doeff, Marca M; Chen, Jiajun; Conry, Thomas E.; Wang, Ruigang; Wilcox, James; Aumentado, Albert

2009-12-14T23:59:59.000Z

418

Thermochromic effect at room temperature of Sm{sub 0.5}Ca{sub 0.5}MnO{sub 3} thin films  

SciTech Connect

Sm{sub 0.5}Ca{sub 0.5}MnO{sub 3} thermochromic thin films were synthesized using dc reactive magnetron co-sputtering and subsequent annealing in air. The film structure was studied by x-ray diffraction analysis. To validate the thermochromic potentiality of Sm{sub 0.5}Ca{sub 0.5}MnO{sub 3}, electrical resistivity and infrared transmittance spectra were recorded for temperatures ranging from 77 K to 420 K. The temperature dependence of the optical band gap was estimated in the near infrared range. Upon heating, the optical transmission decreases in the infrared domain showing a thermochromic effect over a wide wavelength range at room temperature.

Boileau, A.; Capon, F.; Barrat, S.; Pierson, J. F. [Universite de Lorraine, Institut Jean Lamour, Departement CP2S, UMR CNRS 7198, Nancy, F-54042 (France); Laffez, P. [Groupe de Recherche Electronique, Materiaux, Acoustique, Nanoscience (GREMAN), Universite Francois Rabelais de Tours, UMR CNRS 7347, IUT de Blois, 15 rue de la Chocolaterie, Blois, F-41000 (France)

2012-06-01T23:59:59.000Z

419

Free-Standing Na2/3Fe1/2Mn1/2O2@Graphene Film for a Sodium-Ion Battery Cathode  

Science Journals Connector (OSTI)

Free-Standing Na2/3Fe1/2Mn1/2O2@Graphene Film for a Sodium-Ion Battery Cathode ... Graphene is a well-known material endowed with numerous advantages that have led to its extensive use as a conductive additive in Li-ion batteries, including superior electronic conductivity, a large surface area, and excellent mechanical strength. ...

Hongli Zhu; Kang Taek Lee; Gregory Thomas Hitz; Xiaogang Han; Yuanyuan Li; Jiayu Wan; Steven Lacey; Arthur von Wald Cresce; Kang Xu; Eric Wachsman; Liangbing Hu

2014-03-03T23:59:59.000Z

420

MICROSTRUCTURE STUDY ON THE La0.7Sr0.3MnO3 AND RARE-EARTH OXIDE VERTICALLY ALIGNED NANOCOMPOSITE THIN FILMS  

E-Print Network (OSTI)

NANOCOMPOSITE THIN FILMS Approved by: Research Advisor: Haiyan Wang Director for Undergraduate Research... A&M University Research Advisor: Dr. Haiyan Wang Department of Electrical and Electrical Engineering Two-phase (La0.7Sr0.3MnO3)0.5:(CeO2)0.5 (LSMO:CeO2) heteroepitaxial nanocomposite films were grown on SrTiO3 (STO) (001) by pulsed laser...

Hazariwala, Harshad

2011-05-05T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

PHYSICAL REVIEW B 85, 174110 (2012) Crystal structures, strain analysis, and physical properties of Sr0.7Ce0.3MnO3  

E-Print Network (OSTI)

phase transitions were proposed: an octahedral tilting transition at Tc, 938 K (Pm¯3m I4/mcm, R+ 4+ , introducing Jahn-Teller (JT)­active Mn3+ (d4 ) ions. This brings about a transition to a tetragonal structure ), and an isosymmetric, electronically driven (Jahn-Teller­like) transition at Tc,JT 770 K (I4/mcm, R+ 4 I4/mcm, R+ 4

Cambridge, University of

422

Non-aqueous solution preparation of doped and undoped Li{sub x}Mn{sub y}O{sub z}  

DOE Patents (OSTI)

A method is described for generation of phase-pure doped and undoped Li{sub x}Mn{sub y}O{sub z} precursors. The method of this invention uses organic solutions instead of aqueous solutions or nonsolution ball milling of dry powders to produce phase-pure precursors. These precursors can be used as cathodes for lithium-polymer electrolyte batteries. Dopants may be homogeneously incorporated to alter the characteristics of the powder. 1 fig.

Boyle, T.J.; Voigt, J.A.

1997-05-20T23:59:59.000Z

423

Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot C. Le Gall,1  

E-Print Network (OSTI)

Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot C. Le Gall,1 A spin in a CdTe QD, like the strain- induced magnetic anisotropy or hyperfine coupling to the nuclei in this study is grown on a ZnTe substrate and contains CdTe QDs. A 6.5 monolayer thick CdTe layer is deposited

Boyer, Edmond

424

Improved Hydrogen Storage Performance of MgH2-LiAlH4 Composite by Addition of MnFe2O4  

E-Print Network (OSTI)

Improved Hydrogen Storage Performance of MgH2-LiAlH4 Composite by Addition of MnFe2O4 Qi Wan, Ping storage properties of MgH2-LiAlH4, prepared by ball milling, are studied for the first time. The hydrogen/L) densities are extremely eager for on-board hydrogen storage in fuel cell vehicles according to the U.S. DOE

Volinsky, Alex A.

425

Deposition and characterization of YBa2Cu3O7 /LaMnO3 / MgO/TiN heterostructures on Cu metal substrates for  

E-Print Network (OSTI)

-on-cube epitaxy is observed. While the Cu/TiN and TiN/MgO interfaces are rough, the MgO and LaMnO3 layers . Reduced Jc of approximately 1 MA/cm2 on rolled Cu tapes is limited by damage to the tape surface during- ity of the coatings, reliability of these conductors against thermal transients, and limitation

Pennycook, Steve

426

Synthesis, crystal structure and properties of [(dien){sub 2}Mn]Ge{sub 2}S{sub 4} with mixed-valent Ge centers  

SciTech Connect

One new manganese thiogermanate, [(dien){sub 2}Mn]Ge{sub 2}S{sub 4} (dien=diethylenetriamine), was prepared under mild solvothermal conditions and structurally and spectroscopically characterized. The title compound crystallizes in the orthorhombic system, chiral space group P2{sub 1}2{sub 1}2{sub 1} (no. 19) with a=9.113(4) , b=12.475(5) , c=17.077(7) , V=1941.5(15) {sup 3} and Z=4. Its structure features a three-dimensional (3D) network composed of a one-dimensional (1D) [Ge{sub 2}S{sub 4}]{sup 2?} anionic chain and a [(dien){sub 2}Mn]{sup 2+} complex interconnected via various hydrogen bonds. The most interesting structural feature of the compound is the presence of two different oxidation states of germanium centers in the 1D [Ge{sub 2}S{sub 4}]{sup 2?} chain, which is also supported by the result of X-ray photoelectron spectroscopy measurement. The optical property of the title compound has also been studied by UVvis spectra. - Graphical abstract: One new thiogermanate, [(dien){sub 2}Mn]Ge{sub 2}S{sub 4}, contains a one-dimensional [Ge{sub 2}S{sub 4}]{sup 2?} anionic chain with two different oxidation states of germanium centers. Display Omitted - Highlights: One new manganese thiogermanate [(dien){sub 2}Mn]Ge{sub 2}S{sub 4} was prepared. The compound features 1D [Ge{sub 2}S{sub 4}]{sup 2?} chain composed of [Ge{sup II}S{sub 4}] and [Ge{sup IV}S{sub 4}] tetrahedra. The first example of inorganicorganic hybrid thiogermanates with mixed valent Ge centers.

Yue, Cheng-Yang; Yuan, Zhuang-Dong; Zhang, Lu-Ge; Wang, Ya-Bai; Liu, Guo-Dong; Gong, Liao-Kuo [Key Laboratory of Inorganic Chemistry in Universities of Shandong, Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155 (China); Lei, Xiao-Wu, E-mail: xwlei_jnu@163.com [Key Laboratory of Inorganic Chemistry in Universities of Shandong, Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155 (China); State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan, Shandong 250100 (China)

2013-10-15T23:59:59.000Z

427

A neutron diffraction study of the magnetic structure for the perovskite-type mixed oxides La(Mn, Cr)03 and (La, Sr)Fe03  

E-Print Network (OSTI)

and Type A Magnetic Cell.............................. 55 12. Magnetic Structure Types A and G According to Semicovalent Bonding Scheme ........................................ 59 13. Temperature Difference Pattern and Magnetic Cell for G... techniques have been applied to the study of the magnetic structure properties of perovskite-type compounds La(Cr,Mn)02 and (La^S^FeOy The perovskite cell is ideally cubic with one molecule ABO^ per unit cell. For the compounds studied the B ion located...

Bents, Ulrich H.

2013-10-04T23:59:59.000Z

428

Development of Cu1.3Mn1.7O4 spinel coating on ferritic stainless steel for solid oxide fuel cell interconnects  

Science Journals Connector (OSTI)

Abstract To protect solid oxide fuel cells (SOFCs) from chromium poisoning and to improve area specific resistance (ASR), Cu1.3Mn1.7O4 is thermally grown on AISI 430 ferritic stainless steel. The samples are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy equipped with energy dispersive spectroscopy (FESEM-EDS) and 4-probe ASR tests. The results show that the coating not only decreases the ASR considerably, but also acts as a barrier to mitigate the sub-scale growth and to prevent chromium migration through the coating and the cathode. The EDS analysis reveals that a mixed spinel region is formed between the coating and oxide scale after 500h oxidation at 750C causing a noticeable decrease in oxygen diffusivity through this layer and subsequent decline in sub-scale growth rate. The ASR of uncoated sample is measured to be 63.5m?cm2 after 500h oxidation, while the Cu1.3Mn1.7O4 spinel coated sample shows a value of 19.3m?cm2 representing ?70% reduction compared to the uncoated sample. It is proposed that the high electrical conductivity of Cu1.3Mn1.7O4 (140Scm?1), reduction of oxide scale growth, and good bonding between the coating and substrate contribute to the substantial ASR reduction for the coated sample.

N. Hosseini; M.H. Abbasi; F. Karimzadeh; G.M. Choi

2015-01-01T23:59:59.000Z

429

Electrochemical behaviors of co-deposited Pb/PbMnO2 composite anode in sulfuric acid solution Tafel and EIS investigations  

Science Journals Connector (OSTI)

The oxygen evolution kinetics and anodic layer properties of Pb/PbMnO2 composite anode during the 72h galvanostatic electrolysis in H2SO4 solution were investigated with Quasi-stationary polarization (Tafel) and Electrochemical Impedance Spectroscopy (EIS) techniques. The results revealed that the anodic activity and reaction kinetics varied a lot during the electrolysis for it is a process indicating the formation and stabilization of anodic layer. At the very beginning of electrolysis, the composite anode exhibited very high oxygen evolution activity since the reaction was controlled by the transformation step of intermediates. Then, its oxygen evolution activity was largely diminished and the rate determination step (rds) became the formation and adsorption of first intermediate, SOHads. In the prolonged electrolysis, the anodic potential gradually decreased and the final stable value was comparable to industrial PbAg (1.0%) anode. On the stable anodic layer after 72h, the oxygen evolution reaction (OER) was still controlled by the formation and adsorption of intermediate, and the adsorption resistance took a dominant part in the whole impedance. Besides, compared with PbAg and Pb anode, although OER at the stable state were all controlled by the intermediate adsorption process, the adsorption resistance of Pb/PbMnO2 anode was much smaller than the other two due to the existence of MnO2 particles and large amount of ?-PbO2 in the stable anodic layer.

Yanqing Lai; Yuan Li; Liangxing Jiang; Wang Xu; Xiaojun Lv; Jie Li; Yexiang Liu

2012-01-01T23:59:59.000Z

430

Signature of magnetic phase separation in the ground state of Pr1-xCaxMnO3  

SciTech Connect

Neutron scattering has been used to investigate the evolution of the long- and short-range charge-ordered (CO), ferromagnetic (FM), and antiferromagnetic (AF) correlations in single crystals of $\\rm Pr_{1-x}Ca_{x}MnO_3$ ($x$ = 0.3, 0.35 and 0.4). These correlations are a ssociated with the existence of spin clusters with populations that drastically depend on the doping ($x$) and temperature. Concentrated spin clusters coexist with long-range canted AF order in a wide temperature range for $x$ = 0.3 while clusters do not appear in the $x$ = 0.4 crystal. In contrast, both CO and AF order parameters in the $x$ = 0.35 crystal show a precipitous decrease below $\\sim$ 35 K where spin clusters form. These results provide direct evidence of magnetic phase separation and indicate that there is a critical doping $x_{c}$ (close to $x$ = 0.35) that divides the phase-separated site-centered from the homogeneous bond-centered or charge-disproportionated CO ground state.

Sha, Hao [Florida International University, Miami; Ye, Feng [ORNL; Dai, Pengcheng [ORNL; Fernandez-Baca, Jaime A [ORNL; Mesa, Dalgis [ORNL; Lynn, J. W. [National Institute of Standards and Technology (NIST); Tomioka, Y. [Correlated Electron Research Center (CERC), Japan; Tokura, Y. [University of Tokyo, Tokyo, Japan; Zhang, Jiandi [Florida International University, Miami

2008-01-01T23:59:59.000Z

431

The electronic and magnetic properties of La{sub 0.85}Zr{sub 0.15}MnO{sub 3} deposited on SrTiO{sub 3} and MgO substrates  

SciTech Connect

The electronic and magnetic properties of tetravalent-ion-doped La{sub 0.85}Zr{sub 0.15}MnO{sub 3} (LZMO) thin films that were epitaxially grown on SrTiO{sub 3} (STO) and MgO substrates were studied using temperature-dependent x-ray diffraction (XRD), x-ray absorption near-edge structure, x-ray linear dichroism, and x-ray magnetic circular dichroism at the Mn L{sub 3,2}- and K-edge. XRD studies reveal that the LZMO thin films have compressive and tensile strains (along the c-axis) on the STO and MgO substrates, respectively. As the temperature is reduced from room temperature to below magnetic transition temperature, the preferentially occupied Mn majority-spin e{sub g} orbital changes from the in-plane d{sub x}{sup 2}{sub -y}{sup 2} to the out-of-plane d{sub 3z}{sup 2}{sub -r}{sup 2} orbital for LZMO/STO, and vice versa for LZMO/MgO. Experimental results suggest that the new hopping path that is mediated by the Mn{sup 2+} ions triggers a stronger d{sub 3z}{sup 2}{sub -r}{sup 2} orbital ordering of Mn{sup 3+} ions and enhances the ferromagnetic coupling between the Mn spin moments of t{sub 2g} electrons in LZMO/STO, whereas the strong tensile strain stabilizes the d{sub x}{sup 2}{sub -y}{sup 2} orbital by inducing lattice distortions of the MnO{sub 6} octahedra in LZMO/MgO.

Deshpande, N. G. [Department of Physics, Tamkang University, Tamsui 251, Taiwan (China); Department of Physics, Shivaji University, Kolhapur-416004, Maharashtra (India); Weng, C. H.; Wang, Y. F.; Shao, Y. C.; Cheng, C. Q.; Ling, D. C., E-mail: dcling@mail.tku.edu.tw, E-mail: wfpong@mail.tku.edu.tw; Hsueh, H. C.; Du, C. H.; Pong, W. F., E-mail: dcling@mail.tku.edu.tw, E-mail: wfpong@mail.tku.edu.tw [Department of Physics, Tamkang University, Tamsui 251, Taiwan (China); Tsai, H. M.; Pao, C. W.; Lin, H. J.; Lee, J. F. [National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan (China); Chiou, J. W. [Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan (China); Tsai, M. H. [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China)

2014-06-21T23:59:59.000Z

432

High-performance \\{PEGylated\\} MnZn ferrite nanocrystals as a passive-targeted agent for magnetically induced cancer theranostics  

Science Journals Connector (OSTI)

Abstract An effective magnetic nanocrystals (MNCs)-mediated theranostics strategy as a combination of simultaneous diagnostics and heating treatment of tumors by using magnetic resonance imaging (MRI) and alternating current magnetic field (ACMF) is successfully developed. In this strategy, we had firstly synthesized a well-established MnZn ferrite \\{MNCs\\} coated with PEG-phospholipids (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol copolymers, DSPE-PEG2000). The monodisperse \\{PEGylated\\} \\{MNCs\\} with coreshell structure (15nm) exhibited excellent performance, such as high magnetism of 98emug?1 Fe, relaxivity coefficient (r2) of 338mm?1s?1, and specific absorption rate (SAR) value of 324Wg?1 Fe. It was proved that the obtained \\{MNCs\\} with an average diameter of 48.6nm can drastically minimize the recognition and phagocytosis of macrophages, simultaneously improve their biocompatibility invitro. These advantages endowed them with efficient passive targeting ability invivo for prominent tumor MRI and magnetically induced heating when exposed to ACMF, based on enhanced permeability and retention (EPR) effects. To ensure sufficient accumulation of \\{MNCs\\} within tumors for targeted hyperthermia, we described the use of \\{MNCs\\} with a well-tolerated intravenous single dose of 18mg Fe/kg mouse body weight, achieving repeatedly injection and hyperthermia within a subcutaneous breast cell carcinoma mouse model. With an ACMF of 12 A at 390kHz, the tumor surface sites could be heated to approximately 43C in 30min based on MNCs-mediated intravenous injections. The long-lasting hyperthermia could effectively induce the apoptosis of tumor cells, inhibit the angiogenesis of tumor vessels, and finally suppress the tumor growth within a certain period of time.

Jun Xie; Yu Zhang; Caiyun Yan; Lina Song; Song Wen; Fengchao Zang; Gong Chen; Qi Ding; Changzhi Yan; Ning Gu

2014-01-01T23:59:59.000Z

433

Magnetocrystalline interactions and oxidation state determination of Mn{sub (2?x)}V{sub (1+x)}O{sub 4} (x=0, 1/3 and 1) magnetorresistive spinel family  

SciTech Connect

Oxidation states of transition metal cations in spinels-type oxides are sometimes extremely difficult to determine by conventional spectroscopic methods. One of the most complex cases occurs when there are different cations, each one with several possible oxidation states, as in the case of the magnetoresistant Mn{sub (2?x)}V{sub (1+x)}O{sub 4} (x=0, 1/3 and 1) spinel-type family. In this contribution we describe the determination of the oxidation state of manganese and vanadium in Mn{sub (2?x)}V{sub (1+x)}O{sub 4} (x=0, 1/3,1) spinel-type compounds by analyzing XANES and high-resolution K? X-ray fluorescence spectra. The ionic models found are Mn{sup 2+}{sub 2}V{sup 4+}O{sub 4}, Mn{sup 2+}{sub 5/3}V{sup 3.5+}{sub 4/3}O{sub 4} and Mn{sup 2+}V{sup 3+}{sub 2}O{sub 4}. Combination of the present results with previous data provided a reliable cation distribution model. For these spinels, single magnetic electron paramagnetic resonance (EPR) lines are observed at 480 K showing the interaction among the different magnetic ions. The analysis of the EPR parameters show that g-values and relative intensities are highly influenced by the concentration and the high-spin state of Mn{sup 2+}. EPR broadening linewidth is explained in terms of the bottleneck effect, which is due to the presence of the fast relaxing V{sup 3+} ion instead of the weak Mn{sup 2+} (S state) coupled to the lattice. The EPR results, at high temperature, are well explained assuming the oxidation states of the magnetic ions obtained by the other spectroscopic techniques. - Graphical abstract: View of the crystallographic structure of a spinel. It shows as an example one of the models of ion distribution determined for the spinels Mn{sub (2?x)}V{sub (1+x)}O{sub 4} (x=0, 1/3,1). Display Omitted - Highlights: Determination of oxidation state of the metallic ions in Mn{sub (2?x)}V{sub (1+x)}O{sub 4} (x=0,1/3,1) by XAS and XES techniques. The ionic models found are Mn{sup 2+}{sub 2}V{sup 4+}O{sub 4}, Mn{sup 2+}{sub 5/3}V{sup 3.5+}{sub 4/3}O{sub 4} and Mn{sup 2+}V{sup 3+}O{sub 4}. EPR spectra correspond almost exclusively to a resonance of Mn{sup 2+}.

Pomiro, F. [INFIQC-CONICET, Departamento de Fisicoqumica, Facultad de Ciencias Qumicas, Universidad Nacional de Crdoba, Ciudad Universitaria, 5000 Crdoba (Argentina); Ceppi, S. [IFEG-CONICET and Facultad de Matemtica, Astronoma y Fsica, Universidad Nacional de Crdoba, Ciudad Universitaria, 5000 Crdoba (Argentina); De Paoli, J.M. [INFIQC-CONICET, Departamento de Fisicoqumica, Facultad de Ciencias Qumicas, Universidad Nacional de Crdoba, Ciudad Universitaria, 5000 Crdoba (Argentina); Snchez, R.D. [Centro Atmico Bariloche, Comisin Nacional de Energa Atmica e Instituto Balseiro, Universidad Nacional de Cuyo, 8400 San Carlos de Bariloche (RN) (Argentina); Mesquita, A. [Instituto de Geocincias e Cincias Exatas, Universidade Estadual Paulista, 13506-900 Rio Claro, So Pablo (Brazil); Tirao, G., E-mail: gtirao@famaf.unc.edu.ar [IFEG-CONICET and Facultad de Matemtica, Astronoma y Fsica, Universidad Nacional de Crdoba, Ciudad Universitaria, 5000 Crdoba (Argentina); and others

2013-09-15T23:59:59.000Z

434

Structural Analysis of the Mn(IV)/Fe(III) Cofactor of Chlamydia Trachomatis Ribonucleotide Reductase By Extended X-Ray Absorption Fine Structure Spectroscopy And Density Functional Theory Calculations  

SciTech Connect

The class Ic ribonucleotide reductase from Chlamydia trachomatis (C{bar A}) uses a stable Mn(lV)/ Fe(lll) cofactor to initiate nucleotide reduction by a free-radical mechanism. Extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DFT) calculations are used to postulate a structure for this cofactor. Fe and Mn K-edge EXAFS data yield an intermetallic distance of -2.92 {angstrom}. The Mn data also suggest the presence of a short 1.74 {angstrom} Mn-O bond. These metrics are compared to the results of DFT calculations on 12 cofactor models derived from the crystal structure of the inactive Fe2(lll/ III) form of the protein. Models are differentiated by the protonation states of their bridging and terminal OH{sub x} ligands as well as the location of the Mn(lV) ion (site 1 or 2). The models that agree best with experimental observation feature a{mu}-1, 3-carboxylate bridge (E120), terminal solvent (H{sub 2}O/OH) to site 1, one {mu}-O bridge, and one {mu}-OH bridge. The site-placement of the metal ions cannot be discerned from the available data.

Younker, J.M.; Krest, C.M.; Jiang, W.; Krebs, C.; Bollinger, J.M.Jr.; Green, M.T.

2009-05-28T23:59:59.000Z

435

Relationship Between Onset Thresholds, Trigger Types, and Rotation Shear for the m/n=2/1 Neoclassical Tearing Mode in a High-? Spherical Torus  

SciTech Connect

The onset conditions for the m/n=2/1 neoclassical tearing mode (NTM) are studied in terms of neoclassical drive, triggering instabilities, and toroidal rotation or rotation shear, in the spherical torus NSTX [M. Ono, et al., Nuclear Fusion 40, 557 (2000)]. There are three typical onset conditions for these modes, given in order of increasing neoclassical drive required for mode onset: triggering by energetic particle modes, triggering by edge localized modes, and cases where the modes appear to grow without a trigger. In all cases, the required drive increases with toroidal rotation shear, implying a stabilizing effect from the shear.

Gerhardt, S. P.; Brennan, D. P.; Buttery, R.; La Haye, R. J.; Sabbagh, S.; Strait, E.; Bell, M.; Bell, R.; Fredrickson, E.; Gates, D.; LeBlanc, B.; Menard, J.; Stutman, D.; Tritz, K.; Yuh, H.

2009-02-24T23:59:59.000Z

436

Spin-phonon coupling in Gd(Co{sub 1/2}Mn{sub 1/2})O{sub 3} perovskite  

SciTech Connect

We have investigated the temperature-dependent Raman-active phonons and the magnetic properties of Gd(Co{sub 1/2}Mn{sub 1/2})O{sub 3} perovskite ceramics in the temperature range from 40?K to 300?K. The samples crystallized in an orthorhombic distorted simple perovskite, whose symmetry belongs to the Pnma space group. The data reveal spin-phonon coupling near the ferromagnetic transition occurring at around 120?K. The correlation of the Raman and magnetization data suggests that the structural order influences the magnitude of the spin-phonon coupling.

Silva, R. X. [Curso Cincias Naturais, Universidade Federal do Maranho, Campus VII, 65400-000 Cod-MA (Brazil); Departamento de Fsica, Universidade Federal do Maranho, Campus do Bacanga, 65085-580 So Luis-MA (Brazil); Reichlova, H. [Institute of Physics ASCR, v.v.i., Cukrovarnick 10, 162 53 Praha 6 (Czech Republic); Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Praha 2 (Czech Republic); Marti, X. [Institute of Physics ASCR, v.v.i., Cukrovarnick 10, 162 53 Praha 6 (Czech Republic); Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Praha 2 (Czech Republic); Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720-7300 (United States); Barbosa, D. A. B. [Departamento de Fsica, Universidade Federal do Maranho, Campus do Bacanga, 65085-580 So Luis-MA (Brazil); Department of Chemistry, University of North Florida, 1 UNF Drive, Jacksonville, Florida 32224 (United States); Lufaso, M. W. [Department of Chemistry, University of North Florida, 1 UNF Drive, Jacksonville, Florida 32224 (United States); Araujo, B. S.; Ayala, A. P. [Departamento de Fsica, Universidade Federal do Cear, Campus do Pici, P.O. Box 6030, 60455-970 Fortaleza-CE (Brazil); and others

2013-11-21T23:59:59.000Z

437

Competition of interbilayer magnetic couplings in R1.4Sr1.6Mn2O7 (R=La1-zNdz)  

Science Journals Connector (OSTI)

Chemical substitution effects on the magnetic and transport properties have been investigated for single crystals of (La1-zNdz)1.4Sr1.6Mn2O7 with bilayer structure. We have found that the ferromagnetic ground state for z=0.0 is replaced by a layered antiferromagnetic state with alternating ferromagnetic bilayers beyond z>~0.1. Reflecting the subtle balance of the competing interbilayer exchange couplings, application of an external magnetic field induces an antiferromagnetic-ferromagnetic transition. The transition accompanies a switching-type reduction of the current-perpendicular-to-plane resistivity, which can be viewed as a spin-valve functionality.

Y. Moritomo; K. Ohoyama; M. Ohashi

1999-01-01T23:59:59.000Z

438

Controlling magnetic anisotropy in La{sub 0.7}Sr{sub 0.3}MnO{sub 3} nanostructures  

SciTech Connect

We have developed a chlorine based dry etching process for nanopatterning the ferromagnetic oxide La{sub 0.7}Sr{sub 0.3}MnO{sub 3} (LSMO). Large arrays of millions of identical structures have been fabricated from thin LSMO films by electron-beam lithography and reactive ion etching. SQUID magnetometry demonstrates that patterned nanostructures with lateral dimensions down to 100?nm retain their full magnetization and the Curie temperature of the bulk layer. In addition, their shape anisotropy is sufficient to overcome the crystalline anisotropy of the bulk. High resolution scanning transmission electron microscopy shows that crystallinity is preserved even at the edges of the nanostructures.

Wahler, M.; Bttner, B.; Blaschek, H.-H.; Homonnay, N.; Wid, O. [Institut fr Physik, Martin-Luther-Universitt Halle-Wittenberg, D-06099 Halle (Germany); O'Shea, K. J.; McGrouther, D.; MacLaren, D. A. [SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom); Schmidt, G., E-mail: georg.schmidt@physik.uni-halle.de [Institut fr Physik, Martin-Luther-Universitt Halle-Wittenberg, D-06099 Halle (Germany); IZM, Martin-Luther-Universitt Halle-Wittenberg, D-06099 Halle (Germany)

2014-02-03T23:59:59.000Z

439

Emergence of Long Range One-Dimensional Nanostructures in a Disordered Two-Dimensional System: Mn-Doped Ti1+?S2  

Science Journals Connector (OSTI)

This surface is characterized by a high density of small isotropic pits typically only a few nanometers in diameter. ... Dark rectangular patches in the image are burn marks resulting from electron beam exposure to the insulating/oxidized surface. ... The irregularly shaped pit defects observed on all MnxTi1+?S2 samples used in this study are commonly observed on dichalcogenide crystals,(17-19) though the concentration was unusually high and attributed to the poor stoichiometry and the addition of the Mn intercalates. ...

Andrew J. Stollenwerk; Aaron OShea; Erik Wolter; Michael W. Roth; Laura H. Strauss; Timothy E. Kidd

2011-12-02T23:59:59.000Z

440

Low-Spin Hexacoordinate Mn(III): Synthesis and Spectroscopic Investigation of Homoleptic Tris(pyrazolyl)borate and Tris(carbene)borate Complexes  

Science Journals Connector (OSTI)

Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, United States ... To correct for changes in the frequency-dependent emission spectrum over time and to discriminate electric dipole transitions in the sample material from spin-induced magnetic dipole transitions, FT reference spectra, I0(?), taken at thermal energies well above the energy of the ground-state spin transitions (e.g., 40 K) were divided by I(?), the FT spectra taken at very low temperature (e.g., 2 K). ... This complex reacts with strong oxidants (e.g., O2, NO+, and Ag+) to reform the Mn(IV) complex. ...

Adam P. Forshaw; Jeremy M. Smith; Andrew Ozarowski; J. Krzystek; Dmitry Smirnov; S. A. Zvyagin; T. David Harris; Hemamala I. Karunadasa; Joseph M. Zadrozny; Alexander Schnegg; Karsten Holldack; Timothy A. Jackson; Ahmad Alamiri; Diane M. Barnes; Joshua Telser

2012-12-24T23:59:59.000Z

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Structure and magnetism of low-doped monoclinic crystals of (Ga{sub 1-x}Mn{sub x}){sub 2}Se{sub 3}  

SciTech Connect

The influence that doping with Mn{sup 3+} ions has on the fine crystal structure of the monoclinic compound Ga{sub 2}Se{sub 3} was studied by single-crystal neutron diffraction and the measurements of magnetic properties. It was found that the structural state of the crystals changes even at relatively low doping levels (x = 0.04). Local Jahn-Teller distortions were shown to be responsible for the formation of the fine structure and magnetism in this type of compounds.

Dubinin, S. F., E-mail: dubinin@uraltc.ru; Maksimov, V. I.; Parkhomenko, V. D. [Russian Academy of Sciences, Institute of Metal Physics, Ural Branch (Russian Federation)

2011-12-15T23:59:59.000Z

442

Jahn-Teller Phonon Anomaly and Dynamic Phase Fluctuations in La{sub 0.7}Ca{sub 0.3}MnO{sub 3}  

SciTech Connect

Inelastic neutron scattering was used to study the temperature (T) dependence of the lattice excitations in La{sub 0.7}Ca {sub 0.3}MnO {sub 3} . An optical Jahn-Teller phonon exhibits continuous but anomalous damping with increasing temperature in the ferromagnetic-metallic phase and collapses above the Curie temperature T{sub C} (240K). We attribute this anomaly to the growing dynamic phase segregation as T{yields}T{sub C} , thus providing evidence of local fluctuations associated with the short-range polaron or charge/orbital ordering in the ferromagnetic-metallic state.

Zhang, Jiandi; Dai, Pengcheng; Fernandez-Baca, J. A.; Plummer, E. W.; Tomioka, Y.; Tokura, Y.

2001-04-23T23:59:59.000Z

443

Short-Range Polaron Correlations in the Ferromagnetic La{sub 1-x}Ca{sub x}MnO{sub 3}  

SciTech Connect

We use neutron scattering to demonstrate the presence of lattice polarons and their short-range correlations for several samples of La{sub 1-x}Ca {sub x}MnO{sub 3} in the Ca doping range 0.15{<=}x{<=}0.3 . We establish the doping dependence of the orientation, commensuration, and coherence length of the polaron correlations and show that the populations of correlated and uncorrelated polarons are intimately related to the transport properties of the materials. (c) 2000 The American Physical Society.

Dai, Pengcheng [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)] [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Fernandez-Baca, J. A. [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)] [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Wakabayashi, N. [Department of Physics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, (Japan)] [Department of Physics, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, (Japan); Plummer, E. W. [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States) [Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Department of Physics, University of Tennessee, Knoxville, Tennessee 37966 (United States); Tomioka, Y. [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-8562, (Japan)] [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-8562, (Japan); Tokura, Y. [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-8562, (Japan) [Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-8562, (Japan); Department of Applied Physics, University of Tokyo, Tokyo 113-8656, (Japan)

2000-09-18T23:59:59.000Z

444

Magnetic depth profile of a modulation doped La{sub 1-x}Ca{sub x}MnO{sub 3} exchange-biased system.  

SciTech Connect

Recent magnetometry measurements in modulation-doped La{sub 1-x}Ca{sub x}MnO{sub 3} suggested that a net magnetization extends from the ferromagnetic layers into the adjacent antiferromagnet layers. Here we test this hypothesis by polarized neutron reflectometry, which allows us to determine the depth resolved magnetization profile. From fits to the reflectivity data we find that the additional magnetization does not occur at the ferromagnetic/antiferromagnetic interfaces, but rather in a thin region of the first antiferromagnetic layer adjacent to the interface with the substrate.

Hoffmann, A.; May, S. J.; teVelthuis, S. G. E.; Park, S.; Fitzsimmons, M. R.; Campillo, G.; Gomez, M. E.; LANL; Pusan National Univ.; Universidad del Valle; Universidad Autonoma de Madrid

2009-01-01T23:59:59.000Z

445

Characterization, average and electronic structures during chargedischarge cycle in 0.6Li2MnO30.4Li(Co1/3Ni1/3Mn1/3)O2 solid solution of a cathode active material for Li-ion battery  

Science Journals Connector (OSTI)

Abstract The 0.6Li2MnO30.4Li(Co1/3Ni1/3Mn1/3)O2 solid solution was prepared by the co-precipitation method. The average structure analysis based on the Rietveld method using neutron diffraction was carried out. As a result, the charging process eliminated Li from the transition metal layer as well as the lithium layer, and the dominant elimination of Li was suggested to be from the 2b site (S.G.; C2/m). The amount of the cation mixing of Ni at the 2c site in the Li layer tended to increase from the first to fifth cycles. It was suggested that Co moved to the 4g site after discharge, but to the 2b site after charging. On the other hand, the opposite tendency was shown for Mn. In addition, an electronic-structure analysis based on the Maximum Entropy Method was carried out. The covalent linkage increased in 4h-4i and 4h-8j between the first and fifth charge processes. It was also found that most of the Li in the 4h site was not extracted at the fifth cycle compared to the first cycle.

Yasushi Idemoto; Ryosuke Kawai; Naoya Ishida; Naoto Kitamura

2015-01-01T23:59:59.000Z

446

EXTRACTS FROM A REPORT PRESENTED TO THE CORPORATION OF THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY BY ARTHUR A. NOYES, ACTING-PRESIDENT  

Science Journals Connector (OSTI)

...further study of turbine and gas en-gines and of...conditions of their life outside such as lead...conditions of student life are considered...only so far as the remaining time permits and...prepara-tion for a life of service which...

1908-03-20T23:59:59.000Z

447

Effects of Nb doping level on the electronic transport, photoelectric effect and magnetoresistance across La{sub 0.5}Ca{sub 0.5}MnO{sub 3}/Nb:SrTiO{sub 3} junctions  

SciTech Connect

Heterojunctions composed of La{sub 0.5}Ca{sub 0.5}MnO{sub 3} and Nb doped SrTiO{sub 3} were fabricated, and the effects of the Nb doping level on their electronic transport, photoelectric effect, and magnetoresistance were investigated. A lower doping concentration of Nb led to better rectifying properties and higher open circuit voltages. The I-V curves for La{sub 0.5}Ca{sub 0.5}MnO{sub 3}/0.7?wt.?% Nb-SrTiO{sub 3} showed a negligible response to magnetic fields for all temperatures, whereas La{sub 0.5}Ca{sub 0.5}MnO{sub 3}/0.05?wt.?% Nb-SrTiO{sub 3} exhibited distinct magnetoresistance, which depended on both the bias voltage and temperature. These results are discussed with the assistance of conventional semiconductor theories.

Wang, J. F., E-mail: jifewang@gmail.com [Department of Physics, The University of Hong Kong, Pokfulam Road (Hong Kong); College of Science, China Jiliang University, Hangzhou, Zhejiang 310018 (China); Jiang, Y. C.; Gao, J., E-mail: jugao@hku.hk [Department of Physics, The University of Hong Kong, Pokfulam Road (Hong Kong); Chen, M. G. [College of Science, China Jiliang University, Hangzhou, Zhejiang 310018 (China)] [College of Science, China Jiliang University, Hangzhou, Zhejiang 310018 (China)

2013-12-16T23:59:59.000Z

448

Spin waves throughout the Brillouin zone and magnetic exchange coupling in the ferromagnetic metallic manganites La{sub 1-x}Ca{sub x}MnO{sub 3} (x=0.25,0.30)  

SciTech Connect

Using time-of-flight and triple-axis inelastic neutron spectroscopy, we determine spin-wave excitations throughout the Brillouin zone for ferromagnetic manganites La{sub 1-x}Ca{sub x}MnO{sub 3} (x=0.25,0.3) in their low-temperature metallic states. While spin-wave excitations in the long-wavelength limit (spin stiffness D) have similar values for both compounds, the excitations near the Brillouin-zone boundary of La{sub 0.7}Ca{sub 0.3}MnO{sub 3} are considerably softened in all symmetry directions compared to that of La{sub 0.75}Ca{sub 0.25}MnO{sub 3}. A Heisenberg model with the nearest neighbor and the fourth neighbor exchange interactions can describe the overall dispersion curves fairly well. We compare the data with various theoretical models describing the spin excitations of ferromagnetic manganites.

Ye, F. [Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Dai Pengcheng [Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200 (United States); Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Fernandez-Baca, J. A. [Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States); Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200 (United States); Adroja, D. T.; Perring, T. G. [ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX (United Kingdom); Tomioka, Y. [Correlated Electron Research Center (CERC), Tsukuba 305-0046 (Japan); Tokura, Y. [Correlated Electron Research Center (CERC), Tsukuba 305-0046 (Japan); Department of Applied Physics, University of Tokyo, Tokyo 113-8656 (Japan)

2007-04-01T23:59:59.000Z

449

Layered Li1+x(Ni0.425Mn0.425Co0.15)1xO2 Positive Electrode Materials for Lithium-Ion Batteries  

E-Print Network (OSTI)

Layered Li1+x(Ni0.425Mn0.425Co0.15)1­xO2 Positive Electrode Materials for Lithium-Ion Batteries : Layered Li1+x(Ni0.425Mn0.425Co0.15)1­xO2 materials (0 x 0.12) were prepared at 1000°C for 12 h in air transition metal ions induced for charge compensation an increase in the average transition metal oxidation

Boyer, Edmond

450

Ca0.9Mn0.5Ti0.5O3??: A Suitable Oxygen Carrier Material for Fixed-Bed Chemical Looping Combustion under Syngas Conditions  

Science Journals Connector (OSTI)

Ca0.9Mn0.5Ti0.5O3??: A Suitable Oxygen Carrier Material for Fixed-Bed Chemical Looping Combustion under Syngas Conditions ... Power generation using chemical looping combustion (CLC) technology has emerged as a promising CO2-capture-based alternative to conventional technology. ... Because of the high oxidation enthalpy, Ca0.9Mn0.5Ti0.5O3?? does not give full combustion of the syngas; still 95% conversion is achieved. ...

Mehdi Pishahang; Yngve Larring; Michael McCann; Rune Bredesen

2014-06-06T23:59:59.000Z

451

STATEJVU:NT OF CONSIJ mnATIONS RFQllEST B'{ CREE, JNC. (CREE) FOR AN ADV!' NCE \V ;\JVER OF DOrv1ESTIC AND  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

STATEJVU:NT OF CONSIJ mnATIONS STATEJVU:NT OF CONSIJ mnATIONS RFQllEST B'{ CREE, JNC. (CREE) FOR AN ADV!' NCE \V ;\JVER OF DOrv1ESTIC AND FOREIGN PATENT RICI HTS l DER NRFL Si IBCONTRACT NFT-2-224'.26-0l: \V(AJ-2012-0(f The Petitioner, Cree, hns requested a waiver of d imestic and f(m::ign patent rights for all subject inventions arising from its participation under th' above referenced subcontract entitled .. Gearbox Design for U.S.-SourcccL Next ()cneration Dr Vclrain f'or Land-Based and Offshore Wind Turbines;' Cree is a subcumrnctor to the National 1~1.·newnbk Fnergy L<1boratory (NRFL). l Jndcr its subcontract\\ ith NREL. Cree is perfrirming wcrk ll.tnlkd under DF-FOA-0000439. U.S. Wind Power: Next Generation Drivetrain Den:lopmcnt. Under this award. NREL is leading the

452

Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized  

SciTech Connect

Epitaxial thin films of Mn{sub 3-x}Co{sub x}Ga were grown on MgO by magnetron co-sputtering with different Co content. Dependent on the Co content tetragonal or cubic structures are obtained. The composition dependence of saturation magnetization M{sub S} and uniaxial magnetic anisotropy K{sub u} in the epitaxial films were investigated. A high magnetic anisotropy K{sub u} of 1.2 MJ m{sup -3} was achieved for the Mn{sub 2.6}Co{sub 0.3}Ga{sub 1.1} film with low magnetic moment of 0.84 {mu}{sub B}. The valence band spectra of the films were investigated mainly by hard x-ray photoelectron spectroscopy. The evidence of sharp states in the cubic case, which are smeared out in the tetragonal case, proof the existence of a van Hove singularity that causes a band Jahn-Teller effect accompanied by a tetragonal distortion. These differences are in well agreement to the ab-initio calculations of the electronic structure.

Ouardi, Siham; Fecher, Gerhard H.; Stinshoff, Rolf; Felser, Claudia [Max Planck Institute for Chemical Physics of Solids, 01187 Dresden (Germany); Kubota, Takahide; Mizukami, Shigemi; Miyazaki, Terunobu [WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577 (Japan); Ikenaga, Eiji [Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198 (Japan)

2012-12-10T23:59:59.000Z

453

Study of mechanical and dielectric spectrum in YFe{sub 1-x}Mn{sub x}O{sub 3} ceramics  

SciTech Connect

The mechanical spectra of Mn-substituted yttrium orthoferrite YFe{sub 1-x}Mn{sub x}O{sub 3} (x?=?0, 0.2, 0.3, 0.4) ceramics were performed at kilohertz from 100 to 360?K. Two internal friction (IF) peaks are observed around 150?K and 230?K, respectively, and both the IF peaks exhibit frequency dispersion behavior. The IF peak around 150?K is associated with a step increase in the modulus and its mechanical relaxation rate follows the Vogel-Fulcher relation with ?{sub 0}?=?4.45??10{sup ?11}s, E{sub ?}?=?0.03?eV, and T{sub VF}?=?155?K. This IF peak can be explained in terms of a freezing of oxygen vacancies after excluding the possible magnetic spin glass transition. Another IF peak around 230?K presents a relaxation behavior and it follows Arrhenius law. Furthermore, the relaxation behavior was verified by the dielectric spectrum and it can be ascribed to the charge carrier hopping between Fe{sup 2+} and Fe{sup 3+}.

Zhu, Weili; He, Ju; Jin, Yaming; Ti, Ruixia; Xu, Tingting; Yue, Chen; Huang, Fengzhen; Lu, Xiaomei, E-mail: xiaomeil@nju.edu.cn; Zhu, Jinsong, E-mail: jszhu@nju.edu.cn [National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093 (China); Yan, Feng, E-mail: apafyan@polyu.edu.cn [Department of Applied Physics, Hong Kong Polytechnic University, Hong Kong (China)

2014-01-21T23:59:59.000Z

454

Electronic self-organization in the single-layer manganite $\\rm Pr_{1-x}Ca_{1+x}MnO4$  

SciTech Connect

We use neutron scattering to investigate the doping evolution of the magnetic correlations in the single-layer manganite $\\rm Pr_{\\it 1-x}Ca_{\\it 1+x}MnO_4$, away from the $x=0.5$ composition where the CE-type commensurate antiferromagnetic (AF) structure is stable. We find that short-range incommensurate spin correlations develop as the system is electron doped ($x<0.5$), which coexist with the CE-type AF order. This suggests that electron doping in this system induces an inhomogeneous electronic self-organization, where commensurate AF patches with $x=0.5$ are separated by electron-rich domain walls with short range magnetic correlations. This behavior is strikingly different than for the three-dimensional $\\rm Pr_{\\it 1-x}Ca_{\\it x}MnO_3$, where the long-range CE-type commensurate AF structure is stable over a wide range of electron or hole doping around $x=0.5$.

Ye, Feng [ORNL; Chi, Songxue [ORNL; Fernandez-Baca, Jaime A [ORNL; Moreo, Adriana [ORNL; Dagotto, Elbio R [ORNL; Lynn, J. W. [National Institute of Standards and Technology (NIST); Mathieu, R. [Spin Superstructure Project, ERATO, Japan Science and Technology, Tsukuba 305-85; Kaneko, Y. [Spin Superstructure Project, ERATO, Japan Science and Technology, Tsukuba 305-85; Tokura, Y. [University of Tokyo, Tokyo, Japan; Dai, Pengcheng [ORNL

2009-01-01T23:59:59.000Z

455

Scanning tuneeling microscopy studies of fivefold surfaces of icosahedral Al-Pd-Mn quasicrystals and of thin silver films on those surfaces  

SciTech Connect

The present work in this dissertation mainly focuses on the clean fivefold surfaces of i-Al-Pd-Mn quasicrystals as well as the nucleation and growth of Ag films on these surfaces. In addition, Ag film growth on NiAl(110) has been explored in the frame of this dissertation. First, we have investigated the equilibration of a fivefold surface of icosahedral Al-Pd-Mn quasicrystal at 900-915 K and 925-950 K, using Omicron variable temperature scanning tunneling microscope (STM). Annealing at low temperatures resulted in many voids on some terraces while the others were almost void-free. After annealing at 925-950K, void-rich terraces became much rarer. Our STM images suggest that through growth and coalescence of the voids, a different termination becomes exposed on host terraces. All of these observations in our study indicate that even after the quasicrystalline terrace-step structure appears, it evolves with time and temperature. More specifically, based on the STM observations, we conclude that during the annealing a wide range of energetically similar layers nucleate as surface terminations, however, with increasing temperature (and time) this distribution gets narrower via elimination of the metastable void-rich terraces. Next, we have examined the bulk structural models of icosahedral Al-Pd-Mn quasicrystal in terms of the densities, compositions and interplanar spacings for the fivefold planes that might represent physical surface terminations. In our analyses, we mainly have focused on four deterministic models which have no partial or mixed occupancy but we have made some comparisons with an undeterministic model. We have compared the models with each other and also with the available experimental data including STM, LEED-IV, XPD and LEIS. In all deterministic models, there are two different families of layers (a pair of planes), and the nondeterministic model contains similar group of planes. These two families differ in terms of the chemical decoration of their top planes. Hence, we name them as Pd+(with Pd) and Pd-(without Pd). Based on their planer structure and the step height, it can be said that these two families can be viable surface terminations. However, besides the Pd content, these two sets differ in terms of relative densities of their top planes as well as the gap separating the layer from the nearest atomic plane. The experimental data and other arguments lead to the conclusion that the Pd- family is favored over the Pd+. This has an important implication on the interpretation of local motifs seen in the high resolution STM images. In other words, the dark stars are not formed by cut-Bergmans rather they are formed by cut-Mackays.

Unal, Baris

2008-12-01T23:59:59.000Z

456

Microwave Plasma Chemical Vapor Deposition of Carbon Coatings on LiNi1/3Co1/3Mn1/3O2 for Li-Ion Battery Composite Cathodes  

E-Print Network (OSTI)

O 2 for Li-ion Battery Composite Cathodes Marek L. MarcinekRaman spectroscopy. The composite LiNi 1/3 Co 1/3 Mn 1/3 O 2electronic contact within the composite cathode and does not

Doeff, M.M.

2012-01-01T23:59:59.000Z

457

Microwave Plasma Chemical Vapor Deposition of Carbon Coatings on LiNi1/3Co1/3Mn1/3O2 for Li-Ion Battery Composite Cathodes  

SciTech Connect

In this paper, we report results of a novel synthesis method of thin film conductive carbon coatings on LiNi{sub 1/3}Co{sub 1/3}Mn{sub 1/3}O{sub 2} cathode active material powders for lithium-ion batteries. Thin layers of graphitic carbon were produced from a solid organic precursor, anthracene, by a one-step microwave plasma chemical vapor deposition (MPCVD) method. The structure and morphology of the carbon coatings were examined using SEM, TEM, and Raman spectroscopy. The composite LiNi{sub 1/3}Co{sub 1/3}Mn{sub 1/3}O{sub 2} electrodes were electrochemically tested in lithium half coin cells. The composite cathodes made of the carbon-coated LiNi{sub 1/3}Co{sub 1/3}Mn{sub 1/3}O{sub 2} powder showed superior electrochemical performance and increased capacity compared to standard composite LiNi{sub 1/3}Co{sub 1/3}Mn{sub 1/3}O{sub 2} electrodes.

Doeff, M.M.; Kostecki, R.; Marcinek, M.; Wilcoc, J.D.

2008-12-10T23:59:59.000Z

458

arXiv:0712.0277v1[astro-ph]3Dec2007 Mon. Not. R. Astron. Soc. 000, 000000 (0000) Printed 3 December 2007 (MN LATEX style file v2.2)  

E-Print Network (OSTI)

0HA 2RIKEN Cosmic Radiation Lab, 2-1 Hirosawa, Wakoshi, Saitama 351-0198, Japan 3 December 2007 December 2007 (MN LATEX style file v2.2) The effect of radiation pressure on dusty absorbing gas around AGN ABSTRACT Many Active Galactic Nuclei (AGN) are surrounded by gas which absorbs the radiation pro- duced

Gandhi, Poshak

459

Effect of Operating Conditions and H2S Presence on the Performance of CaMg0.1Mn0.9O3?? Perovskite Material in Chemical Looping Combustion (CLC)  

Science Journals Connector (OSTI)

Effect of Operating Conditions and H2S Presence on the Performance of CaMg0.1Mn0.9O3?? Perovskite Material in Chemical Looping Combustion (CLC) ... After the cyclone, particles fall down into a solids reservoir, which acts as a loop seal. ... Industrial & Engineering Chemistry Research (2009), 48 (11), 5542-5547 CODEN: IECRED; ISSN:0888-5885. ...

Arturo Cabello; Alberto Abad; Pilar Gayn; Luis F. de Diego; Francisco Garca-Labiano; Juan Adnez

2014-01-27T23:59:59.000Z

460

Structural, chemical, and electronic state on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] dense thin-film surfaces at high temperature - Surface segregation  

E-Print Network (OSTI)

The evolution of the surface topographic and electronic structure and chemical state of the La0.7Sr0.3MnO3 (LSMO) thin films were probed using Scanning Tunneling microscopy and X-ray photoelectron spectroscopy to identify ...

Jalili, Helia

Note: This page contains sample records for the topic "1996-2012 noyes mn" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Synthesis and electrochemical performance of LiNi0.6Co0.2Mn0.2O2/reduced graphene oxide cathode materials for lithium-ion batteries  

Science Journals Connector (OSTI)

A LiNi0.6Co0.2Mn0.2O2/reduced graphene oxide (RGO) composite with RGO content of 1.2% was prepared by a simple spray-drying method instead of high-energy ball milling method. The composite has been characterized...

Peng Yue; Zhixing Wang; Qian Zhang; Guochun Yan; Huajun Guo; Xinhai Li

2013-10-01T23:59:59.000Z

462

arXiv:1107.5059v1[astro-ph.CO]25Jul2011 Mon. Not. R. Astron. Soc. 000, 120 (2011) Printed 27 July 2011 (MN LATEX style file v2.2)  

E-Print Network (OSTI)

2011 (MN LATEX style file v2.2) The ATLAS3D Project­ VIII: Modelling the Formation and Evolution Coordinating Facility, European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany 11 reproduce the fraction of fast and slow rotators as a function of magnitude in the ATLAS3D survey, assuming

Bureau, Martin

463

arXiv:1005.3649v2[astro-ph.CO]21May2010 Mon. Not. R. Astron. Soc. 000, 114 (200X) Printed 24 May 2010 (MN LATEX style file v2.2)  

E-Print Network (OSTI)

2010 (MN LATEX style file v2.2) Wide-angle tail galaxies in ATLAS Minnie Y. Mao1,2,3 , Rob Sharp2 , D National Facility, PO Box 76, Epping, NSW, 1710, Australia 4National Centre for Radio Astrophysics, Tata) radio sources identified in the ATLAS 1.4 GHz radio survey, and new spec- troscopic redshifts for four

Norris, Ray

464

Effect of oxygen concentration on the magnetic properties of La2CoMnO6 Center for Materials for Information Technology and Department of Chemistry, University of Alabama,  

E-Print Network (OSTI)

Effect of oxygen concentration on the magnetic properties of La2CoMnO6 thin films H. Z. Guo Center; published online 16 November 2007 The dependence of the magnetic properties on oxygen concentration the oxygen background pressure during growth using pulsed laser deposition. Two distinct ferromagnetic FM

Pennycook, Steve

465

Response of the electric resistance of 40-nm-thick La0.67Ca0.33MnO3 films to an increase in the lattice mismatch between film and substrate  

Science Journals Connector (OSTI)

We have studied the structure and resistivity of 40-nm-thick La0.67Ca0.33MnO3 (LCMO) films coherently grown on (001)-oriented La0.29Sr0.71Al0.65Ta0.35O3 single crystal substrates bearing epitaxial interlayers of ...

Yu. A. Boikov; V. A. Danilov

2005-01-01T23:59:59.000Z

466

Thermal expansion of single-crystalline La0.83Sr0.17MnO3: The importance of temperature-induced strain for the electrical resistivity  

E-Print Network (OSTI)

-induced strain for the electrical resistivity J. J. Neumeier Department of Physics, Florida Atlantic University expansion, magnetization, and electrical-resistivity measurements of single crystalline La0.83Sr0.17MnO3 transitions is shown to influence the electrical resistivity. S0163-1829 99 01103-0 The electrical properties

467

Magnetic measurements and neutron diffraction study of the layered hybrid compounds Mn(C{sub 8}H{sub 4}O{sub 4})(H{sub 2}O){sub 2} and Mn{sub 2}(OH){sub 2}(C{sub 8}H{sub 4}O{sub 4})  

SciTech Connect

Mn(C{sub 8}H{sub 4}O{sub 4})(H{sub 2}O){sub 2} and Mn{sub 2}(OH){sub 2}(C{sub 8}H{sub 4}O{sub 4}) layered organic-inorganic compounds based on manganese(II) and terephthalate molecules (C{sub 8}H{sub 4}O{sub 4}{sup 2-}) have been studied by DC and AC magnetic measurements and powder neutron diffraction. The dihydrated compound behaves as a 3D antiferromagnet below 6.5 K. The temperature dependence of its {chi}T product is typical of a 2D Heisenberg system and allows determining the in-plane exchange constant J Almost-Equal-To -7.4 K through the carboxylate bridges. The magnetic structure confirms the in-plane nearest neighbor antiferromagnetic interactions and the 3D ordering. The hydroxide based compound also orders as a 3D antiferromagnet with a higher Neel temperature (38.5 K). Its magnetic structure is described from two antiferromagnetically coupled ferromagnetic sublattices, in relation with the two independent metallic sites. The isothermal magnetization data at 2 K are consistent with the antiferromagnetic ground-state of these compounds. However, in both cases, a slope change points to field-induced modification of the magnetic structure. - Graphical abstract: The macroscopic magnetic properties and magnetic structures of two metal-organic frameworks based on manganese (II) and terephthalate molecules are presented. Highlights: Black-Right-Pointing-Pointer Magnetic study of Mn(C{sub 8}H{sub 4}O{sub 4})(H{sub 2}O){sub 2} and Mn{sub 2}(OH){sub 2}(C{sub 8}H{sub 4}O{sub 4}). Black-Right-Pointing-Pointer Two compounds with common features (interlayer linker/distance, S=5/2 spin). Black-Right-Pointing-Pointer Magnetic measurements quantitatively analyzed to deduce exchange constants. Black-Right-Pointing-Pointer Magnetic structures determined from neutron powder diffraction experiments.

Sibille, Romain, E-mail: romain.sibille@ijl.nancy-universite.fr [Institut Jean Lamour, UMR 7198-Nancy Universite, BP 70239, 54506 Vandoeuvre-les-Nancy Cedex (France); Mesbah, Adel; Mazet, Thomas; Malaman, Bernard [Institut Jean Lamour, UMR 7198-Nancy Universite, BP 70239, 54506 Vandoeuvre-les-Nancy Cedex (France); Capelli, Silvia [Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9 (France); Francois, Michel [Institut Jean Lamour, UMR 7198-Nancy Universite, BP 70239, 54506 Vandoeuvre-les-Nancy Cedex (France)

2012-02-15T23:59:59.000Z

468

Influence of the lanthanum deficit on electrical resistivity and heat capacity of silver-doped lanthanum manganites La{sub 1-x}Ag{sub y}MnO{sub 3}  

SciTech Connect

The electrical resistivity and heat capacity of the silver-doped lanthanum manganites La{sub 0.80}Ag{sub 0.15}MnO{sub 3} and La{sub 0.85}Ag{sub 0.15}MnO{sub 3} have been investigated. Despite the nonstoichiometry of the composition, the La{sub 0.80}Ag{sub 0.15}MnO{sub 3} manganite exhibits a bulk homogeneity and better physical properties from the applied point of view as compared to the La{sub 0.85}Ag{sub 0.15}MnO{sub 3} manganite, viz., the former compound has a higher spontaneous magnetoresistance and a larger jump of the heat capacity with a small width of the phase transition, and the anomalies of the heat capacity and electrical resistivity in the vicinity of the Curie point of this compound agree with the fluctuation nature of the second-order phase transition. The behavior of the properties of lanthanum-deficient manganites under investigation in the region of the phase transition is consistent with the classical theory of indirect exchange interaction. The behavior of the temperature dependence of the electrical resistivity has been analyzed in terms of two models. One of these models is based on the tunneling of charge carriers between ferrons or polarons, and the other model is based on the polaron hopping conduction. Both approaches lead to consistent results, and their combination has made it possible to estimate the tunneling distance of charge carriers. The origin of the influence of technological parameters characterizing the synthesis of La{sub 1-x}Ag{sub y}MnO{sub 3} ceramic materials on their physical properties has been elucidated.

Abdulvagidov, Sh. B., E-mail: abdulvagidov@iwt.ru; Gamzatov, A. G. [Russian Academy of Sciences, Amirkhanov Institute of Physics, Dagestan Scientific Center (Russian Federation); Mel'nikov, O. V.; Gorbenko, O. Yu. [Moscow State University (Russian Federation)

2009-12-15T23:59:59.000Z

469

Modeling-Assisted Growth of New Multiferroics in the MTiO3 (M = Fe, Mn, Ni) Family as Epitaxial Thin Films  

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Modeling-Assisted Growth of New Multiferroics in the MTiO 3 (M = Fe, Mn, Ni) Family as Epitaxial Thin Films Project start date: July, 2011 EMSL Lead Investigator: Tamas Varga Spectroscopy and Diffraction Group, EMSL, PNNL Co-investigators: Mark E. Bowden (EMSL), Timothy C. Droubay (FCSD), Scott A. Chambers (FCSD), Bernd C. Kabius (EMSL), Edoardo Apra (EMSL), and William A. Shelton (EMSL) Collaborators: Trudy B. Bolin (Advanced Photon Source, Argonne National Laboratory, Argonne, IL), Peter E. Schiffer and Venkatraman Gopalan (Pennsylvania State University, University Park, PA) Materials that show simultaneous electric and magnetic order are currently gaining increasing attention due to the fact that such multiferroics show promise for the design of new multifunctional

470

Intrinsic Surface Stability in LiMn2-xNix04-s (x = 0.45, 0.5) High Voltage Spinel Materials for Lithium Ion Batteries  

SciTech Connect

This work reports the surface stability of the high vollage Li ion cathode LiMn2_,Ni,Ooh\\ (x = 0.5, 0.45) by comparing thin fi lm and powder composite electrodes after cycling using X-ray photoelectron spectroscopy. The thin film electrodes offer the abili ty to probe the surface of the material without the need of a conductive agent and polymer binder typically used in composite electrodes. The resulls suggest that neither oxidation of PP6 to POF3 nor the decomposition of ethylene carbonate or dimethylene carbonate occurs on the surface of the spinel material. These resulls confirm the enhanced cycling stability and rate capability associated with the high vollage spinel material and suggests that the SE!IIayer fonns due to the reaction of electrochemically inactive components in composite electrodes with the electrolyte.

Carroll, Kyler J [University of California, San Diego; Yang, Ming-Che [University of Florida, Gainesville; Veith, Gabriel M [ORNL; Dudney, Nancy J [ORNL; Meng, Ying Shirley [University of California, San Diego

2012-01-01T23:59:59.000Z